Release beta_v0.1.0

Release Note:

- feature:
  - capture the screenshot, and copy it in clipboard or save it to local file
  - annotate the screenshot with in many ways, e.g. Line, Arrow, Text, Mosaic...
  - upload the screenshot to remote server and copy path, e.g. OBS, SCP, FTP...
  - extract text from the screenshot (OCR), and copy to clipboard
  - describe the screenshot by AI according your requirements

- other:
  - Landing page for promo
  - README.md and AGENTS.md for AI and Humman developers

AGENTS.md

@@ -0,0 +1,67 @@
+# AGENTS.md
+
+## 项目概述
+
+SnapGo 是一个常驻菜单栏的轻量截图工具：全局快捷键唤起选区截图，确认后自动上传到 S3 兼容对象存储（或通过 SSH/SCP 保存到远端），并把可分享链接复制到剪贴板。目前主要打磨 macOS 体验。
+
+技术栈：**Wails v2**（Go 后端 + WebView 前端）+ **Vue 3 / TypeScript / Vite** 前端。Go 后端遵循分层架构（domain → application → infrastructure），macOS 上截图选区使用原生 AppKit overlay，其它平台回退到 Wails 透明窗口 overlay。
+
+### 分层架构（`internal/`）
+
+- `domain/`：核心业务类型与接口，**不依赖任何第三方 SDK 或 OS API**（仅标准库）。如 `OSSProvider` 接口、`AppConfig`/`S3Config`/`SSHConfig`、`Screenshot`/`UploadResult`。
+- `application/`：用例编排（capture → upload/save → clipboard → notify）。**只依赖 domain 接口**，具体适配器从 `main.go`/`app.go` 注入，便于单测。如 `CaptureAndUploadService`、`CaptureActionsService`、`CaptureAndSSHService`、`ApplyAnnotations`。
+- `infrastructure/`：对接外部世界的适配器实现 —— `oss/`(S3)、`ssh/`(内置 Go client + Kerberos 委托系统 ssh)、`clipboard/`、`config/`(JSON 文件存储)、`screencapture/`、`display/`、`cursor/`、`hotkey/`、`tray/`(菜单栏)、`logging/`。
+
+### 顶层文件（`main` 包，根目录）
+
+- `main.go`：Wails 启动入口，embed `frontend/dist`，装配 tray 与 `App`。
+- `app.go`：`App` 结构体，通过 Wails `Bind` 暴露给前端的方法（RPC），编排截图/上传/保存流程与 overlay 窗口生命周期。
+- `*_darwin.go` / `*_other.go`：平台分离的 overlay、dock 图标、激活策略、帧刷新等实现。`native_overlay_darwin.go` 使用 cgo + AppKit。
+
+### 关键约定
+
+- 前端通过 Wails 自动生成的 `frontend/wailsjs/go/main/App.js` 调用后端 `App` 的导出方法；后端通过 `wruntime.EventsEmit` 向前端推事件（如 `upload:success`、`upload:failure`、`hotkey:ready`、`capture:overlay`）。
+- 新增 OSS provider 只需在 `infrastructure/oss/` 加适配器并实现 `domain.OSSProvider`，无需改 application 层。
+- S3 与 SSH 走独立 pipeline（`runUploadPipeline` vs `runSaveRemotePipeline`），避免 provider 分支泄漏进彼此。
+
+## 构建与命令
+
+依赖前置：Go 1.23+、Node/npm、`wails` CLI（`go install github.com/wailsapp/wails/v2/cmd/wails@latest`）。
+
+- `go mod tidy`：同步 Go 依赖。
+- `wails dev`：开发模式（热重载前端 + 后端），日志可直接在终端看到。
+- `wails build -platform darwin/arm64 -clean`：构建 `.app`（产物在 `build/bin/`）。
+- `./scripts/create-dev-cert.sh`：首次创建本地自签开发证书（保证 macOS TCC 权限不被反复重置）。
+- `./scripts/dev-build.sh`：本地迭代用 —— 构建 + 稳定证书重签名 + 同步到 `/Applications` + 打开。优先用它而非裸 `wails build`。
+- `./scripts/release.sh`：一键 build → sign → DMG → notarize（notarize 需 `NOTARIZE=1` 与凭证，默认跳过）。`ARCH=universal` 可出 fat binary。
+- 前端单独命令（`frontend/`）：`npm run dev` / `npm run build`（`vue-tsc --noEmit && vite build`）/ `npm run preview`。
+
+## 代码风格
+
+- **Go**：标准 `gofmt`（tab 缩进）。包级 doc 注释说明“设计动机/rationale”是本仓库的强约定，注释解释“为什么”而非“是什么”。导出标识符必须有注释。错误用 `fmt.Errorf("...: %w", err)` 包装。日志统一用 `log/slog`（结构化 kv，如 `slog.Info("...", "host", h)`）。
+- **平台分离**：用 `_darwin.go` / `_other.go` 文件名后缀或 `//go:build` 标签隔离平台代码，保持跨平台编译通过。
+- **TypeScript/Vue**：Vue 3 `<script setup>` + Composition API；2 空格缩进。视图在 `frontend/src/views/`，组件在 `components/`。
+- 注释中可使用中文（部分 infra 包如 logging 已用中文 rationale），与现有文件保持一致即可。
+- 不要手改 `frontend/wailsjs/` 下文件，它们由 Wails 生成。
+
+## 测试
+
+- 框架：Go 标准 `testing` 包（无第三方断言库）。运行：`go test ./...`。
+- 现有测试集中在 `internal/application/`（如 `capture_actions_test.go`、`annotation_test.go`）。
+- 约定：application 层依赖 domain 接口，测试用手写 fake 实现（如 `fakeClipboard`、`fakeNotifier`）注入，不触碰真实 OS/网络。文件 IO 测试使用 `t.TempDir()`。
+- infrastructure 适配器（S3/SSH/screencapture 等）依赖真实环境，通常不写单测；SSH 连通性可借助 `cmd/sshdiag/` 诊断工具与设置页的 “Test connection” 按钮验证。
+
+## 安全
+
+- **凭证落盘**：配置（含 S3 access key、SSH 密码）以 JSON 存于 `os.UserConfigDir()/SnapGo/config.json`，文件权限 `0600`、目录 `0700`。尚未接入 OS keychain（后续计划），改动配置存储时务必保持严格权限并避免把密钥写入日志。
+- **日志**：写入 `~/Library/Logs/SnapGo/snapgo.log`（大小滚动，5MiB×2 备份）。记录连接信息时只记 host/user/port 等非敏感字段，**切勿记录密码/密钥**（参考 `app.go` 中的 `slog` 用法）。
+- **SSH**：`StrictHostKey=false` 时使用 `InsecureIgnoreHostKey()`（牺牲安全换首启可用性，仅限个人 LAN）；Kerberos 模式委托系统 `/usr/bin/ssh` 复用 `kinit` 凭证缓存。`PathPrefix` 相对远端 `$HOME`，会剥离前导 `/` 和 `~` 防止逃逸。
+- **上传兜底**：上传失败时把 PNG 落地到 `~/Pictures/SnapGo` 并复制本地路径，保证不丢截图。
+- macOS 需 Screen Recording / Accessibility（TCC）权限；稳定的代码签名身份与安装路径是权限保持的关键（见 `dev-build.sh` 注释）。
+
+## 配置
+
+- Wails 项目配置：`wails.json`（产物名、frontend install/build/dev 命令、应用元信息）。
+- 运行时配置：首启写入默认值（`domain.DefaultAppConfig()`：快捷键 `cmd+shift+a`、S3 `pathPrefix=snapgo/`、SSH port 22 / timeout 10s）。原子写入（temp + rename）。
+- 环境变量：`SNAPGO_LOG_LEVEL=debug|info|warn|error`（默认 debug）。Release 相关：`ARCH`、`NOTARIZE`、`SIGN_MODE`、`DEVELOPER_ID_APPLICATION`、`KEYCHAIN_PROFILE`、`APPLE_ID`/`APPLE_TEAM_ID`/`APPLE_APP_SPECIFIC_PASSWORD`。
+- S3 兼容性：`UsePathStyle` 默认 true（适配 MinIO/R2）；`PublicURLBase` 可选用于 CDN/自定义域名，否则回退 `{Endpoint}/{Bucket}/{Key}`。

README.md

@@ -21,6 +21,7 @@ SnapGo 是一个为“截完图马上发链接”而做的轻量截图工具。
 - 全局快捷键触发：无论当前在什么应用里，都能快速发起截图
 - 菜单栏常驻：随用随取，不打断主流程
 - 支持 S3 兼容存储：可接入 AWS S3、MinIO、Cloudflare R2、Backblaze B2 等
+- 支持 FTP / SFTP：可通过独立截图操作上传到文件服务器，并复制远端路径
 - 支持自定义公开地址：可配合 CDN 或自定义域名使用
 - 上传失败自动兜底：至少保住截图文件，不会白截
 
@@ -57,11 +58,11 @@ SnapGo 是一个为“截完图马上发链接”而做的轻量截图工具。
 
 ## 使用方式
 
-1. 打开应用，填写你的 S3 兼容对象存储配置
+1. 打开应用，填写 S3、FTP / SFTP 或 SSH 远端配置
 2. 保存并测试连接
 3. 按下默认快捷键 `cmd+shift+a`
 4. 框选截图区域
-5. 直接粘贴刚刚自动复制好的图片链接
+5. 点击目标上传按钮，直接粘贴自动复制的图片链接或远端路径
 
 ## 当前体验
 

activation_policy_darwin.go

@@ -5,6 +5,12 @@ package main
 /*
 #cgo CFLAGS: -x objective-c -fobjc-arc
 #cgo LDFLAGS: -framework AppKit
+// Silence the "ignoring duplicate libraries: '-lobjc'" note emitted by the
+// Xcode 15+ linker (ld-prime): cgo links -lobjc for our Objective-C code and
+// the Go darwin runtime pulls it in as well, which the new linker flags as a
+// duplicate. Suppressing it here keeps the build output clean; the flag is a
+// no-op on the legacy ld64 path.
+#cgo LDFLAGS: -Wl,-no_warn_duplicate_libraries
 #include <dispatch/dispatch.h>
 #import <AppKit/AppKit.h>
 

app.go

@@ -3,13 +3,16 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
 	"image"
+	"image/png"
 	"log/slog"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -21,8 +24,10 @@ import (
 	"github.com/mmmy/snapgo/internal/infrastructure/clipboard"
 	"github.com/mmmy/snapgo/internal/infrastructure/config"
 	"github.com/mmmy/snapgo/internal/infrastructure/display"
+	ftppkg "github.com/mmmy/snapgo/internal/infrastructure/ftp"
 	"github.com/mmmy/snapgo/internal/infrastructure/hotkey"
 	llmpkg "github.com/mmmy/snapgo/internal/infrastructure/llm"
+	ocrpkg "github.com/mmmy/snapgo/internal/infrastructure/ocr"
 	"github.com/mmmy/snapgo/internal/infrastructure/oss"
 	"github.com/mmmy/snapgo/internal/infrastructure/screencapture"
 	sshpkg "github.com/mmmy/snapgo/internal/infrastructure/ssh"
@@ -32,8 +37,8 @@ import (
 //
 // We deliberately keep this struct small: it owns long-lived collaborators
 // (config store, hotkey manager, capturer, clipboard) but delegates the
-// real work to the application service constructed on demand once an OSS
-// provider is configured.
+// real work to application services constructed on demand for the selected
+// storage destination.
 type App struct {
 	ctx context.Context
 
@@ -320,17 +325,32 @@ func (a *App) runUploadPipeline(provider domain.OSSProvider, pngBytes []byte) er
 func (a *App) runCopyImagePipeline(pngBytes []byte) error {
 	svc := &application.CaptureActionsService{
 		Clipboard: a.clip,
-		Notifier:  &runtimeNotifier{ctx: a.ctx},
 	}
-	return svc.CopyImage(a.ctx, pngBytes)
+	a.emitOperationStatus("copy", "复制中", "正在把截图复制到剪贴板", "running")
+	if err := svc.CopyImage(a.ctx, pngBytes); err != nil {
+		a.emitOperationStatus("copy", "复制失败", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	a.emitOperationStatus("copy", "复制完成", "截图已复制到剪贴板", "success")
+	wruntime.EventsEmit(a.ctx, "upload:success", "image copied to clipboard")
+	return nil
 }
 
 func (a *App) runSaveImagePipeline(pngBytes []byte, dir string) (string, error) {
 	svc := &application.CaptureActionsService{
 		Clipboard: a.clip,
-		Notifier:  &runtimeNotifier{ctx: a.ctx},
 	}
-	return svc.SaveImage(a.ctx, pngBytes, dir)
+	a.emitOperationStatus("save", "保存中", "正在保存截图到本地", "running")
+	path, err := svc.SaveImage(a.ctx, pngBytes, dir)
+	if err != nil {
+		a.emitOperationStatus("save", "保存失败", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return "", err
+	}
+	a.emitOperationStatus("save", "保存完成", "文件路径已复制到剪贴板："+path, "success")
+	wruntime.EventsEmit(a.ctx, "upload:success", path)
+	return path, nil
 }
 
 // runSaveRemotePipeline uploads the captured PNG to the configured SSH host
@@ -382,17 +402,61 @@ func (a *App) runSaveRemotePipeline(pngBytes []byte) error {
 	return nil
 }
 
+// runFTPUploadPipeline uploads through the protocol selected in FTPConfig and
+// copies the resulting remote path. FTP/SFTP remains separate from both S3
+// (public URL semantics) and SSH/SCP (a distinct toolbar destination).
+func (a *App) runFTPUploadPipeline(pngBytes []byte) error {
+	a.mu.RLock()
+	cfg := a.cfg
+	a.mu.RUnlock()
+
+	if !cfg.IsFTPConfigured() {
+		err := fmt.Errorf("FTP/SFTP host/user is not configured")
+		a.emitOperationStatus("ftp-upload", "需要配置 FTP/SFTP", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+
+	uploader, err := ftppkg.NewUploader(cfg.FTP)
+	if err != nil {
+		a.emitOperationStatus("ftp-upload", "FTP/SFTP 配置错误", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	slog.Info("FTP/SFTP upload dispatch",
+		"protocol", cfg.FTP.Protocol,
+		"host", cfg.FTP.Host,
+		"user", cfg.FTP.User,
+		"port", cfg.FTP.Port,
+		"auth_method", cfg.FTP.AuthMethod,
+		"strict_host_key", cfg.FTP.StrictHostKey,
+		"has_password", cfg.FTP.Password != "",
+		"png_size", len(pngBytes))
+
+	svc := &application.CaptureAndFTPService{
+		Uploader:  uploader,
+		Clipboard: a.clip,
+		Notifier:  &runtimeNotifier{ctx: a.ctx},
+		Cfg:       cfg.FTP,
+	}
+	protocolLabel := strings.ToUpper(cfg.FTP.Protocol)
+	if protocolLabel == "" {
+		protocolLabel = "FTP"
+	}
+	a.emitOperationStatus("ftp-upload", "上传中", "正在上传截图到 "+protocolLabel, "running")
+	if err := svc.ExecuteWithBytes(a.ctx, pngBytes); err != nil {
+		a.emitOperationStatus("ftp-upload", "上传失败", err.Error(), "error")
+		return err
+	}
+	a.emitOperationStatus("ftp-upload", "上传完成", "远端路径已复制到剪贴板", "success")
+	return nil
+}
+
 func (a *App) runSummaryPipeline(pngBytes []byte) error {
 	a.mu.RLock()
 	cfg := a.cfg
 	a.mu.RUnlock()
 
-	if !cfg.IsS3Configured() {
-		err := fmt.Errorf("请先在 S3 配置页填写可用的对象存储配置")
-		a.emitOperationStatus("summary", "需要配置 S3", err.Error(), "error")
-		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
-		return err
-	}
 	if !cfg.IsLLMConfigured() {
 		err := fmt.Errorf("请先在 LLM 配置页填写 API Key 和模型")
 		a.emitOperationStatus("summary", "需要配置 LLM", err.Error(), "error")
@@ -400,28 +464,52 @@ func (a *App) runSummaryPipeline(pngBytes []byte) error {
 		return err
 	}
 
+	providerID, llmCfg, _ := cfg.ActiveLLMProvider()
+	visionClient, err := llmpkg.NewVisionClient(providerID, llmCfg)
+	if err != nil {
+		a.emitOperationStatus("summary", "LLM 配置错误", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+
+	svc := &application.CaptureSummaryService{
+		Summarizer:     visionClient,
+		Clipboard:      a.clip,
+		Prompt:         cfg.LLM.Prompt,
+		PathPrefix:     cfg.S3.PathPrefix,
+		MaxInlineBytes: llmCfg.MaxInlineBytes,
+	}
+
+	// Preferred path: send the screenshot inline as a base64 data URL so the
+	// summary never depends on S3 being configured or publicly reachable.
+	if svc.CanInline(pngBytes) {
+		a.emitOperationStatus("summary", "识别中", "正在请求多模态模型（本地内联图片）", "running")
+		summary, err := svc.Summarize(a.ctx, svc.InlineDataURL(pngBytes))
+		if err != nil {
+			a.emitOperationStatus("summary", "识别失败", err.Error(), "error")
+			wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+			return err
+		}
+		return a.finishSummary(svc, summary)
+	}
+
+	// Oversized image: fall back to uploading to S3 and passing a public URL.
+	if !cfg.IsS3Configured() {
+		err := fmt.Errorf("截图尺寸超过内联上限（%d 字节），请缩小截图区域，或在 S3 配置页填写公网可达的对象存储后重试", llmCfg.MaxInlineBytes)
+		a.emitOperationStatus("summary", "尺寸超限", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+
 	s3Provider, err := oss.NewS3Provider(cfg.S3)
 	if err != nil {
 		a.emitOperationStatus("summary", "S3 配置错误", err.Error(), "error")
 		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
 		return err
 	}
-	providerID, llmCfg, _ := cfg.ActiveLLMProvider()
-	visionClient, err := llmpkg.NewVisionClient(providerID, llmCfg)
-	if err != nil {
-		a.emitOperationStatus("summary", "LLM 配置错误", err.Error(), "error")
-		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
-		return err
-	}
-	svc := &application.CaptureSummaryService{
-		Provider:   s3Provider,
-		Summarizer: visionClient,
-		Clipboard:  a.clip,
-		Prompt:     cfg.LLM.Prompt,
-		PathPrefix: cfg.S3.PathPrefix,
-	}
+	svc.Provider = s3Provider
 
-	a.emitOperationStatus("summary", "上传中", "正在上传截图供模型读取", "running")
+	a.emitOperationStatus("summary", "上传中", "截图较大，正在上传供模型读取", "running")
 	uploaded, err := svc.UploadImage(a.ctx, pngBytes)
 	if err != nil {
 		a.emitOperationStatus("summary", "上传失败", err.Error(), "error")
@@ -429,6 +517,20 @@ func (a *App) runSummaryPipeline(pngBytes []byte) error {
 		return err
 	}
 
+	// The remote model fetches the URL itself, so verify it is reachable and
+	// clean up the temporary object once we are done with it either way.
+	defer func() {
+		if derr := svc.DeleteUploaded(a.ctx, uploaded.Key); derr != nil {
+			slog.Warn("summary: failed to delete temporary object", "key", uploaded.Key, "err", derr)
+		}
+	}()
+
+	if err := svc.EnsureReachable(a.ctx, uploaded.URL); err != nil {
+		a.emitOperationStatus("summary", "链接不可达", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+
 	a.emitOperationStatus("summary", "识别中", "图片已上传，正在请求多模态模型", "running")
 	summary, err := svc.Summarize(a.ctx, uploaded.URL)
 	if err != nil {
@@ -436,17 +538,64 @@ func (a *App) runSummaryPipeline(pngBytes []byte) error {
 		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
 		return err
 	}
+	return a.finishSummary(svc, summary)
+}
+
+// finishSummary copies the summary to the clipboard and emits the terminal
+// success/failure UI state shared by the inline and S3 paths.
+func (a *App) finishSummary(svc *application.CaptureSummaryService, summary string) error {
 	if err := svc.CopySummary(a.ctx, summary); err != nil {
 		a.emitOperationStatus("summary", "复制失败", err.Error(), "error")
 		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
 		return err
 	}
-
 	a.emitOperationStatus("summary", "识别完成", "总结已复制到剪贴板", "success")
 	wruntime.EventsEmit(a.ctx, "upload:success", "summary copied to clipboard")
 	return nil
 }
 
+func (a *App) runOCRPipeline(pngBytes []byte) error {
+	a.mu.RLock()
+	cfg := a.cfg
+	a.mu.RUnlock()
+
+	if !cfg.IsOCRConfigured() {
+		err := fmt.Errorf("请先在文字提取配置页填写 OCR Provider 的 AccessKey ID 和 AccessKey Secret")
+		a.emitOperationStatus("ocr", "需要配置 OCR", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+
+	providerID, ocrCfg, _ := cfg.ActiveOCRProvider()
+	recognizer, err := ocrpkg.NewClient(providerID, ocrCfg)
+	if err != nil {
+		a.emitOperationStatus("ocr", "OCR 配置错误", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+
+	svc := &application.CaptureOCRService{
+		Recognizer: recognizer,
+		Clipboard:  a.clip,
+	}
+
+	a.emitOperationStatus("ocr", "识别中", "正在提取截图文字", "running")
+	text, err := svc.Recognize(a.ctx, pngBytes)
+	if err != nil {
+		a.emitOperationStatus("ocr", "识别失败", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	if err := svc.CopyText(a.ctx, text); err != nil {
+		a.emitOperationStatus("ocr", "复制失败", err.Error(), "error")
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	a.emitOperationStatus("ocr", "提取完成", "文字已复制到剪贴板", "success")
+	wruntime.EventsEmit(a.ctx, "upload:success", "ocr text copied to clipboard")
+	return nil
+}
+
 func (a *App) consumePendingCapture() (*pendingCapture, error) {
 	a.pendingMu.Lock()
 	pc := a.pending
@@ -467,7 +616,8 @@ func (a *App) captureSelectedPNG(result CaptureResult, pc *pendingCapture) ([]by
 		return nil, err
 	}
 	if len(result.Annotations) > 0 {
-		cropped, err = application.ApplyAnnotations(cropped, result.Annotations, pc.Display.Scale)
+		scaleX, scaleY := annotationScalesForCapture(cropped, rect, pc.Display.Scale)
+		cropped, err = application.ApplyAnnotationsWithScale(cropped, result.Annotations, scaleX, scaleY)
 		if err != nil {
 			return nil, err
 		}
@@ -475,6 +625,33 @@ func (a *App) captureSelectedPNG(result CaptureResult, pc *pendingCapture) ([]by
 	return cropped, nil
 }
 
+func annotationScalesForCapture(pngBytes []byte, rect RegionRect, fallback float64) (float64, float64) {
+	if fallback <= 0 {
+		fallback = 1
+	}
+	scaleX := fallback
+	scaleY := fallback
+
+	cfg, err := png.DecodeConfig(bytes.NewReader(pngBytes))
+	if err != nil {
+		return scaleX, scaleY
+	}
+	if rect.W > 0 && cfg.Width > 0 {
+		scaleX = saneAnnotationScale(float64(cfg.Width)/float64(rect.W), fallback)
+	}
+	if rect.H > 0 && cfg.Height > 0 {
+		scaleY = saneAnnotationScale(float64(cfg.Height)/float64(rect.H), fallback)
+	}
+	return scaleX, scaleY
+}
+
+func saneAnnotationScale(scale, fallback float64) float64 {
+	if scale >= 0.25 && scale <= 8 {
+		return scale
+	}
+	return fallback
+}
+
 func (a *App) chooseSaveDirectory() (string, error) {
 	return wruntime.OpenDirectoryDialog(a.ctx, wruntime.OpenDialogOptions{
 		Title:                "Save screenshot to folder",
@@ -564,6 +741,33 @@ func (a *App) TestSSHConnection(cfg domain.SSHConfig) error {
 	return nil
 }
 
+// TestFTPConnection performs a write/delete probe with the supplied FTP or
+// SFTP configuration so Settings can verify both authentication and remote
+// directory permissions before saving.
+func (a *App) TestFTPConnection(cfg domain.FTPConfig) error {
+	slog.Info("RPC TestFTPConnection",
+		"protocol", cfg.Protocol,
+		"host", cfg.Host,
+		"user", cfg.User,
+		"port", cfg.Port,
+		"auth_method", cfg.AuthMethod,
+		"strict_host_key", cfg.StrictHostKey,
+		"has_password", cfg.Password != "")
+	uploader, err := ftppkg.NewUploader(cfg)
+	if err != nil {
+		return err
+	}
+	if err := uploader.TestConnection(a.ctx); err != nil {
+		slog.Error("RPC TestFTPConnection failed",
+			"protocol", cfg.Protocol,
+			"host", cfg.Host,
+			"user", cfg.User,
+			"err", err)
+		return err
+	}
+	return nil
+}
+
 // CaptureNow is the in-app trigger.
 func (a *App) CaptureNow() {
 	go a.runInteractiveCapture()
@@ -795,6 +999,30 @@ func (a *App) SaveRegionToRemote(result CaptureResult) error {
 	return a.runSaveRemotePipeline(cropped)
 }
 
+// UploadRegionToFTP uploads the selected region through the configured FTP or
+// SFTP destination. This is the non-macOS Wails overlay action.
+func (a *App) UploadRegionToFTP(result CaptureResult) error {
+	pc, err := a.consumePendingCapture()
+	if err != nil {
+		slog.Warn("UploadRegionToFTP: no pending capture", "err", err)
+		return err
+	}
+	defer func() {
+		a.capturing.Store(false)
+		a.dismissOverlay()
+	}()
+
+	a.dismissOverlay()
+	flushFrame()
+	cropped, err := a.captureSelectedPNG(result, pc)
+	if err != nil {
+		slog.Error("UploadRegionToFTP: capture failed", "err", err)
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	return a.runFTPUploadPipeline(cropped)
+}
+
 // SummarizeRegion uploads the selected screenshot to S3, sends the public URL
 // to the configured multimodal LLM, and copies the resulting summary.
 func (a *App) SummarizeRegion(result CaptureResult) error {
@@ -824,6 +1052,35 @@ func (a *App) SummarizeRegion(result CaptureResult) error {
 	return a.runSummaryPipeline(cropped)
 }
 
+// ExtractTextRegion sends the selected screenshot to the configured OCR
+// provider and copies the extracted text to the clipboard.
+func (a *App) ExtractTextRegion(result CaptureResult) error {
+	pc, err := a.consumePendingCapture()
+	if err != nil {
+		slog.Warn("ExtractTextRegion: no pending capture", "err", err)
+		return err
+	}
+	defer func() {
+		a.capturing.Store(false)
+		a.dismissOverlay()
+	}()
+
+	a.dismissOverlay()
+	flushFrame()
+
+	slog.Info("ExtractTextRegion: capturing region",
+		"x", result.Rect.X, "y", result.Rect.Y,
+		"w", result.Rect.W, "h", result.Rect.H,
+		"annotations", len(result.Annotations))
+	cropped, err := a.captureSelectedPNG(result, pc)
+	if err != nil {
+		slog.Error("ExtractTextRegion: capture failed", "err", err)
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	return a.runOCRPipeline(cropped)
+}
+
 // SaveNativeRegionToRemote is the macOS-native overlay equivalent of
 // SaveRegionToRemote. The AppKit panel is already closed by the time this
 // runs (see saveRemoteSelection in native_overlay_darwin.go), so we only
@@ -854,6 +1111,29 @@ func (a *App) SaveNativeRegionToRemote(result CaptureResult) error {
 	return a.runSaveRemotePipeline(cropped)
 }
 
+// UploadNativeRegionToFTP is the macOS AppKit overlay equivalent of
+// UploadRegionToFTP. The native panel has already closed when this runs.
+func (a *App) UploadNativeRegionToFTP(result CaptureResult) error {
+	pc, err := a.consumePendingCapture()
+	if err != nil {
+		slog.Warn("UploadNativeRegionToFTP: no pending capture", "err", err)
+		return err
+	}
+	defer func() {
+		a.capturing.Store(false)
+		hideDockIcon()
+	}()
+
+	flushFrame()
+	cropped, err := a.captureSelectedPNG(result, pc)
+	if err != nil {
+		slog.Error("UploadNativeRegionToFTP: capture failed", "err", err)
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	return a.runFTPUploadPipeline(cropped)
+}
+
 // SummarizeNativeRegion is the macOS-native overlay equivalent of
 // SummarizeRegion. The AppKit panel is already closed before this runs.
 func (a *App) SummarizeNativeRegion(result CaptureResult) error {
@@ -881,6 +1161,33 @@ func (a *App) SummarizeNativeRegion(result CaptureResult) error {
 	return a.runSummaryPipeline(cropped)
 }
 
+// ExtractTextNativeRegion is the macOS-native overlay equivalent of
+// ExtractTextRegion. The AppKit panel is already closed before this runs.
+func (a *App) ExtractTextNativeRegion(result CaptureResult) error {
+	pc, err := a.consumePendingCapture()
+	if err != nil {
+		slog.Warn("ExtractTextNativeRegion: no pending capture", "err", err)
+		return err
+	}
+	defer func() {
+		a.capturing.Store(false)
+		hideDockIcon()
+	}()
+
+	flushFrame()
+	slog.Info("ExtractTextNativeRegion: capturing region",
+		"x", result.Rect.X, "y", result.Rect.Y,
+		"w", result.Rect.W, "h", result.Rect.H,
+		"annotations", len(result.Annotations))
+	cropped, err := a.captureSelectedPNG(result, pc)
+	if err != nil {
+		slog.Error("ExtractTextNativeRegion: capture failed", "err", err)
+		wruntime.EventsEmit(a.ctx, "upload:failure", err.Error())
+		return err
+	}
+	return a.runOCRPipeline(cropped)
+}
+
 func parseNativeAnnotations(raw string) []application.Annotation {
 	if raw == "" {
 		return nil
@@ -902,6 +1209,7 @@ func (a *App) CancelRegion() {
 	a.pendingMu.Unlock()
 	a.capturing.Store(false)
 	a.dismissOverlay()
+	a.emitOperationStatus("capture", "已取消", "本次截图已取消", "success")
 }
 
 // CancelNativeRegion releases native-overlay state without touching the
@@ -912,6 +1220,7 @@ func (a *App) CancelNativeRegion() {
 	a.pendingMu.Unlock()
 	a.capturing.Store(false)
 	hideDockIcon()
+	a.emitOperationStatus("capture", "已取消", "本次截图已取消", "success")
 }
 
 // ShowWindow brings the main window back to the foreground in its normal

frontend/package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "dev": "vite",
     "build": "vue-tsc --noEmit && vite build",
+    "test": "node --test tests/*.test.ts",
     "preview": "vite preview"
   },
   "dependencies": {

frontend/package.json.md5

@@ -1 +1 @@
-bb7ffb87329c9ad4990374471d4ce9a4
+e2d56b98c3c8ae5968db0bbb461b5615

frontend/src/App.vue

@@ -22,7 +22,9 @@ import {
   CopyRegionImage,
   SaveRegionImage,
   SaveRegionToRemote,
+  UploadRegionToFTP,
   SummarizeRegion,
+  ExtractTextRegion,
   CancelRegion,
   GetConfig,
 } from '../wailsjs/go/main/App'
@@ -58,16 +60,18 @@ async function loadThemePreference() {
 // `SettingsTab` is hoisted to the App shell so the sidebar (which lives
 // here) and the inner SettingsView (which renders the matching card) can
 // share a single source of truth without an event bus.
-type SettingsTab = 'general' | 's3' | 'ssh' | 'llm'
+type SettingsTab = 'general' | 's3' | 'ftp' | 'ssh' | 'llm' | 'ocr'
 const activeTab = ref<SettingsTab>('general')
 
 // Sidebar entries are declarative so adding a destination type later is
 // a one-line change. The label values match the user-facing tab names.
 const sidebarItems: Array<{ id: SettingsTab; label: string }> = [
-  { id: 'general', label: 'General' },
-  { id: 's3', label: 'S3' },
-  { id: 'ssh', label: 'SSH' },
-  { id: 'llm', label: 'LLM' },
+  { id: 'general', label: '通用设置' },
+  { id: 's3', label: '对象存储' },
+  { id: 'ftp', label: '文件服务' },
+  { id: 'ssh', label: '远程主机' },
+  { id: 'llm', label: '智能识图' },
+  { id: 'ocr', label: '文字提取' },
 ]
 
 interface OverlayPayload {
@@ -77,6 +81,25 @@ interface OverlayPayload {
 }
 const overlayPayload = ref<OverlayPayload | null>(null)
 
+interface OverlayAnnotation {
+  tool: string
+  color: string
+  points: Array<{ x: number; y: number }>
+  text?: string
+  strokeWidth?: number
+  fontSize?: number
+}
+
+interface OverlayResult {
+  rect: {
+    x: number
+    y: number
+    w: number
+    h: number
+  }
+  annotations: OverlayAnnotation[]
+}
+
 const capturing = ref(false)
 
 const toast = ref<{ kind: 'success' | 'error'; text: string } | null>(null)
@@ -121,19 +144,7 @@ async function retryHotkey() {
   }
 }
 
-async function onOverlayConfirm(rect: {
-  rect: {
-    x: number
-    y: number
-    w: number
-    h: number
-  }
-  annotations: Array<{
-    tool: string
-    color: string
-    points: Array<{ x: number; y: number }>
-  }>
-}) {
+async function onOverlayConfirm(rect: OverlayResult) {
   // Optimistically swap back so the window does not visually lag the
   // Go-side hide. If upload fails, the toast surfaces the reason.
   mode.value = 'settings'
@@ -145,19 +156,7 @@ async function onOverlayConfirm(rect: {
   }
 }
 
-async function onOverlayCopy(rect: {
-  rect: {
-    x: number
-    y: number
-    w: number
-    h: number
-  }
-  annotations: Array<{
-    tool: string
-    color: string
-    points: Array<{ x: number; y: number }>
-  }>
-}) {
+async function onOverlayCopy(rect: OverlayResult) {
   mode.value = 'settings'
   overlayPayload.value = null
   try {
@@ -167,19 +166,7 @@ async function onOverlayCopy(rect: {
   }
 }
 
-async function onOverlaySave(rect: {
-  rect: {
-    x: number
-    y: number
-    w: number
-    h: number
-  }
-  annotations: Array<{
-    tool: string
-    color: string
-    points: Array<{ x: number; y: number }>
-  }>
-}) {
+async function onOverlaySave(rect: OverlayResult) {
   mode.value = 'settings'
   overlayPayload.value = null
   try {
@@ -189,19 +176,7 @@ async function onOverlaySave(rect: {
   }
 }
 
-async function onOverlaySaveRemote(rect: {
-  rect: {
-    x: number
-    y: number
-    w: number
-    h: number
-  }
-  annotations: Array<{
-    tool: string
-    color: string
-    points: Array<{ x: number; y: number }>
-  }>
-}) {
+async function onOverlaySaveRemote(rect: OverlayResult) {
   mode.value = 'settings'
   overlayPayload.value = null
   try {
@@ -211,19 +186,17 @@ async function onOverlaySaveRemote(rect: {
   }
 }
 
-async function onOverlaySummarize(rect: {
-  rect: {
-    x: number
-    y: number
-    w: number
-    h: number
+async function onOverlayUploadFTP(rect: OverlayResult) {
+  mode.value = 'settings'
+  overlayPayload.value = null
+  try {
+    await UploadRegionToFTP(rect as any)
+  } catch {
+    /* Surfaced via upload:failure */
   }
-  annotations: Array<{
-    tool: string
-    color: string
-    points: Array<{ x: number; y: number }>
-  }>
-}) {
+}
+
+async function onOverlaySummarize(rect: OverlayResult) {
   mode.value = 'settings'
   overlayPayload.value = null
   try {
@@ -233,6 +206,16 @@ async function onOverlaySummarize(rect: {
   }
 }
 
+async function onOverlayOCR(rect: OverlayResult) {
+  mode.value = 'settings'
+  overlayPayload.value = null
+  try {
+    await ExtractTextRegion(rect as any)
+  } catch {
+    /* Surfaced via upload:failure */
+  }
+}
+
 async function onOverlayCancel() {
   mode.value = 'settings'
   overlayPayload.value = null
@@ -264,6 +247,8 @@ onMounted(() => {
       'success',
       url === 'summary copied to clipboard'
         ? 'Summary copied to clipboard'
+        : url === 'ocr text copied to clipboard'
+          ? 'OCR text copied to clipboard'
         : `Copied: ${url}`
     )
   })
@@ -302,7 +287,9 @@ onUnmounted(() => {
     @copy="onOverlayCopy"
     @save="onOverlaySave"
     @save-remote="onOverlaySaveRemote"
+    @upload-ftp="onOverlayUploadFTP"
     @summarize="onOverlaySummarize"
+    @ocr="onOverlayOCR"
     @cancel="onOverlayCancel"
   />
 

frontend/src/assets/icons/ftp.svg

@@ -0,0 +1 @@
+<svg viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg"><path d="M128 128h768v256H128V128zm64 64v128h640V192H192zm64 48h64v32h-64v-32zM128 448h416v64H192v192h352v64H128V448zm560-32 160 160-45.248 45.248L720 538.496V832h-64V538.496l-82.752 82.752L528 576l160-160z" fill="currentColor"></path></svg>

frontend/src/utils/annotationGeometry.ts

@@ -0,0 +1,28 @@
+export interface AnnotationPoint {
+  x: number
+  y: number
+}
+
+interface PointCollection {
+  points: AnnotationPoint[]
+}
+
+// Annotations are stored relative to the selection origin. Resizing from the
+// top or left moves that origin, so offset the local points in the opposite
+// direction to keep them attached to the same screen pixels.
+export function preserveAnnotationScreenPositions(
+  annotations: PointCollection[],
+  previousOrigin: AnnotationPoint,
+  nextOrigin: AnnotationPoint
+) {
+  const dx = previousOrigin.x - nextOrigin.x
+  const dy = previousOrigin.y - nextOrigin.y
+  if (dx === 0 && dy === 0) return
+
+  for (const annotation of annotations) {
+    for (const point of annotation.points) {
+      point.x += dx
+      point.y += dy
+    }
+  }
+}

frontend/src/views/SettingsView.vue

@@ -7,8 +7,10 @@
  *
  *   • "general" — the global hotkey / capture parameters.
  *   • "s3"      — S3-compatible object-storage credentials.
+ *   • "ftp"     — FTP/SFTP file-transfer destination.
  *   • "ssh"     — SSH/SCP destination for the "save remote" button.
  *   • "llm"     — multimodal screenshot summary provider settings.
+ *   • "ocr"     — cloud OCR provider settings for text extraction.
  *
  * State flow: load() pulls config from Go on mount, save() pushes back.
  */
@@ -17,14 +19,16 @@ import {
   GetConfig,
   SaveConfig,
   TestConnection,
+  TestFTPConnection,
   TestSSHConnection,
   CaptureNow,
 } from '../../wailsjs/go/main/App'
 
 // Tab discriminator shared with the App shell. Kept as a string union so
 // the parent can pass the value without importing a type from this view.
-type TabId = 'general' | 's3' | 'ssh' | 'llm'
+type TabId = 'general' | 's3' | 'ftp' | 'ssh' | 'llm' | 'ocr'
 type ThemeMode = 'auto' | 'light' | 'dark'
+type FTPProtocol = 'ftp' | 'sftp'
 
 const props = defineProps<{
   tab: TabId
@@ -58,6 +62,20 @@ interface SSHConfig {
   connectTimeoutSecs: number
 }
 
+interface FTPConfig {
+  protocol: FTPProtocol
+  host: string
+  port: number
+  user: string
+  authMethod: 'password' | 'key'
+  password: string
+  rootDirectory: string
+  pathPrefix: string
+  strictHostKey: boolean
+  knownHostsPath: string
+  connectTimeoutSecs: number
+}
+
 interface LLMProviderConfig {
   label: string
   baseUrl: string
@@ -74,12 +92,31 @@ interface LLMConfig {
   providers: Record<string, LLMProviderConfig>
 }
 
+interface OCRProviderConfig {
+  label: string
+  endpoint: string
+  accessKeyId: string
+  accessKeySecret: string
+  region: string
+  service: string
+  action: string
+  version: string
+  timeoutSecs: number
+}
+
+interface OCRConfig {
+  activeProvider: string
+  providers: Record<string, OCRProviderConfig>
+}
+
 interface AppConfig {
   hotkey: string
   theme: ThemeMode
   s3: S3Config
   ssh: SSHConfig
+  ftp: FTPConfig
   llm: LLMConfig
+  ocr: OCRConfig
 }
 
 const llmProviderOptions = [
@@ -88,6 +125,11 @@ const llmProviderOptions = [
   { id: 'openai', label: 'ChatGPT / OpenAI-compatible' },
 ]
 
+const ocrProviderOptions = [
+  { id: 'aliyun', label: '阿里云文字识别' },
+  { id: 'volcengine', label: '火山引擎文字识别' },
+]
+
 const themeOptions: Array<{ id: ThemeMode; label: string }> = [
   { id: 'light', label: '浅色' },
   { id: 'dark', label: '深色' },
@@ -121,6 +163,19 @@ function defaultConfig(): AppConfig {
       publicUrlBase: '',
       usePathStyle: true,
     },
+    ftp: {
+      protocol: 'ftp',
+      host: '',
+      port: 21,
+      user: '',
+      authMethod: 'password',
+      password: '',
+      rootDirectory: '/',
+      pathPrefix: 'snapgo/',
+      strictHostKey: false,
+      knownHostsPath: '',
+      connectTimeoutSecs: 10,
+    },
     ssh: {
       host: '',
       port: 22,
@@ -165,6 +220,33 @@ function defaultConfig(): AppConfig {
         },
       },
     },
+    ocr: {
+      activeProvider: 'aliyun',
+      providers: {
+        aliyun: {
+          label: '阿里云文字识别',
+          endpoint: 'https://ocr-api.cn-hangzhou.aliyuncs.com',
+          accessKeyId: '',
+          accessKeySecret: '',
+          region: '',
+          service: '',
+          action: 'RecognizeGeneral',
+          version: '2021-07-07',
+          timeoutSecs: 30,
+        },
+        volcengine: {
+          label: '火山引擎文字识别',
+          endpoint: 'https://visual.volcengineapi.com',
+          accessKeyId: '',
+          accessKeySecret: '',
+          region: 'cn-north-1',
+          service: 'cv',
+          action: 'OCRNormal',
+          version: '2020-08-26',
+          timeoutSecs: 30,
+        },
+      },
+    },
   }
 }
 
@@ -172,6 +254,7 @@ const config = ref<AppConfig>(defaultConfig())
 
 const saving = ref(false)
 const testing = ref(false)
+const testingFTP = ref(false)
 const testingSSH = ref(false)
 const message = ref<{ kind: 'ok' | 'err'; text: string } | null>(null)
 
@@ -189,6 +272,48 @@ const sshPathDisplay = computed({
   },
 })
 
+// FTP and SFTP both upload relative to the authenticated login directory.
+// RootDirectory is display-only: it is prepended to the uploaded relative path
+// when that path is copied, without changing where the file is uploaded.
+const ftpPathDisplay = computed({
+  get: () => config.value.ftp.pathPrefix,
+  set: (raw: string) => {
+    let cleaned = raw.trim()
+    cleaned = cleaned.replace(/^~/, '')
+    cleaned = cleaned.replace(/^\/+/, '')
+    config.value.ftp.pathPrefix = cleaned
+  },
+})
+
+const ftpCopiedPathPreview = computed(() => {
+  const root = config.value.ftp.rootDirectory.trim().replace(/\/+$/, '')
+  const remote = config.value.ftp.pathPrefix
+    .trim()
+    .replace(/^\/+|\/+$/g, '')
+  const remotePrefix = remote ? `${remote}/` : ''
+  return `${root || (config.value.ftp.protocol === 'sftp' ? '~' : '')}/${remotePrefix}2026/07/20260713-110413-18lnbx.png`
+})
+
+function changeFTPProtocol(event: Event) {
+  const next = (event.target as HTMLSelectElement).value as FTPProtocol
+  const previous = config.value.ftp.protocol
+  const previousDefault = previous === 'sftp' ? 22 : 21
+  const previousRootDefault = previous === 'sftp' ? '~/' : '/'
+  if (config.value.ftp.port === previousDefault) {
+    config.value.ftp.port = next === 'sftp' ? 22 : 21
+  }
+  if (config.value.ftp.rootDirectory === previousRootDefault) {
+    config.value.ftp.rootDirectory = next === 'sftp' ? '~/' : '/'
+  }
+  config.value.ftp.protocol = next
+}
+
+function changeFTPAuthMethod(event: Event) {
+  config.value.ftp.authMethod = (event.target as HTMLSelectElement).value as
+    | 'password'
+    | 'key'
+}
+
 const activeLLMProvider = computed(() => {
   const id = config.value.llm.activeProvider || 'openai'
   if (!config.value.llm.providers[id]) {
@@ -198,6 +323,15 @@ const activeLLMProvider = computed(() => {
   return config.value.llm.providers[id]
 })
 
+const activeOCRProvider = computed(() => {
+  const id = config.value.ocr.activeProvider || 'aliyun'
+  if (!config.value.ocr.providers[id]) {
+    config.value.ocr.activeProvider = 'aliyun'
+    return config.value.ocr.providers.aliyun
+  }
+  return config.value.ocr.providers[id]
+})
+
 function normalizeTheme(theme: unknown): ThemeMode {
   return theme === 'light' || theme === 'dark' || theme === 'auto'
     ? theme
@@ -220,11 +354,17 @@ async function load() {
     Object.assign(merged, cfg)
     merged.s3 = { ...merged.s3, ...(cfg as any).s3 }
     merged.ssh = { ...merged.ssh, ...(cfg as any).ssh }
+    merged.ftp = { ...merged.ftp, ...(cfg as any).ftp }
     merged.llm = { ...merged.llm, ...(cfg as any).llm }
     merged.llm.providers = {
       ...defaultConfig().llm.providers,
       ...((cfg as any).llm?.providers ?? {}),
     }
+    merged.ocr = { ...merged.ocr, ...(cfg as any).ocr }
+    merged.ocr.providers = {
+      ...defaultConfig().ocr.providers,
+      ...((cfg as any).ocr?.providers ?? {}),
+    }
     merged.theme = normalizeTheme((cfg as any).theme)
     config.value = merged
     emit('theme-change', config.value.theme)
@@ -255,6 +395,21 @@ async function test() {
   }
 }
 
+async function testFTP() {
+  testingFTP.value = true
+  try {
+    await TestFTPConnection(config.value.ftp as any)
+    flash(
+      'ok',
+      `${config.value.ftp.protocol.toUpperCase()} connection OK — remote directory is writable`
+    )
+  } catch (err: any) {
+    flash('err', `FTP/SFTP test failed: ${err?.message ?? err}`)
+  } finally {
+    testingFTP.value = false
+  }
+}
+
 async function testSSH() {
   testingSSH.value = true
   try {
@@ -385,6 +540,130 @@ onMounted(load)
       </div>
     </section>
 
+    <!-- FTP/SFTP tab — file-transfer destination for its toolbar action. -->
+    <section v-if="props.tab === 'ftp'" class="card">
+      <h2>文件服务</h2>
+      <div class="grid">
+        <label class="field">
+          <span>Protocol</span>
+          <select :value="config.ftp.protocol" @change="changeFTPProtocol">
+            <option value="ftp">FTP</option>
+            <option value="sftp">SFTP (SSH File Transfer Protocol)</option>
+          </select>
+        </label>
+        <label class="field">
+          <span>Port</span>
+          <input
+            v-model.number="config.ftp.port"
+            type="number"
+            min="1"
+            max="65535"
+            :placeholder="config.ftp.protocol === 'sftp' ? '22' : '21'"
+          />
+        </label>
+        <label class="field">
+          <span>Host (IP or domain) *</span>
+          <input v-model.trim="config.ftp.host" placeholder="files.example.com" />
+        </label>
+        <label class="field">
+          <span>User *</span>
+          <input v-model.trim="config.ftp.user" placeholder="snapgo" />
+        </label>
+        <label
+          v-if="config.ftp.protocol === 'sftp'"
+          key="sftp-auth-method"
+          class="field"
+        >
+          <span>Auth method</span>
+          <select
+            :value="config.ftp.authMethod"
+            @change="changeFTPAuthMethod"
+          >
+            <option value="password">Password</option>
+            <option value="key">SSH-Key</option>
+          </select>
+        </label>
+        <label
+          v-if="config.ftp.protocol === 'ftp' || config.ftp.authMethod === 'password'"
+          :key="`${config.ftp.protocol}-password`"
+          class="field"
+        >
+          <span>Password</span>
+          <input v-model="config.ftp.password" type="password" />
+        </label>
+        <label class="field full">
+          <span>根目录（仅用于拼接复制路径）</span>
+          <input
+            v-model.trim="config.ftp.rootDirectory"
+            :placeholder="config.ftp.protocol === 'sftp' ? '~/' : '/'"
+            spellcheck="false"
+          />
+        </label>
+        <label class="field full">
+          <span>Remote directory（登录目录下的上传目录）</span>
+          <input
+            v-model="ftpPathDisplay"
+            placeholder="snapgo/"
+            spellcheck="false"
+          />
+        </label>
+        <label class="field">
+          <span>Connect timeout (sec)</span>
+          <input
+            v-model.number="config.ftp.connectTimeoutSecs"
+            type="number"
+            min="1"
+            max="120"
+            placeholder="10"
+          />
+        </label>
+        <label v-if="config.ftp.protocol === 'sftp'" class="field">
+          <span>Known hosts path</span>
+          <input
+            v-model="config.ftp.knownHostsPath"
+            placeholder="~/.ssh/known_hosts"
+            :disabled="!config.ftp.strictHostKey"
+          />
+        </label>
+        <label v-if="config.ftp.protocol === 'sftp'" class="field checkbox">
+          <input type="checkbox" v-model="config.ftp.strictHostKey" />
+          <span>Strict host key checking (recommended)</span>
+        </label>
+      </div>
+
+      <p class="hint">
+        复制路径示例：<code>{{ ftpCopiedPathPreview }}</code>
+      </p>
+
+      <p v-if="config.ftp.protocol === 'ftp'" class="hint warn">
+        FTP sends the username, password, and screenshot without encryption.
+        Prefer SFTP on networks you do not fully trust. SFTP is not FTPS.
+      </p>
+      <p
+        v-else-if="config.ftp.authMethod === 'key'"
+        class="hint"
+      >
+        SSH-Key mode uses your <code>ssh-agent</code> and
+        <code>~/.ssh/id_*</code> keys.
+      </p>
+      <p
+        v-else-if="!config.ftp.strictHostKey"
+        class="hint warn"
+      >
+        Host key checking is disabled. Enable it for production servers to
+        detect server impersonation.
+      </p>
+
+      <div class="actions">
+        <button class="btn" :disabled="testingFTP" @click="testFTP">
+          {{ testingFTP ? 'Testing…' : 'Test connection' }}
+        </button>
+        <button class="btn primary" :disabled="saving" @click="save">
+          {{ saving ? 'Saving…' : 'Save' }}
+        </button>
+      </div>
+    </section>
+
     <!-- SSH-Conf tab — destination for the save-remote action. -->
     <section v-if="props.tab === 'ssh'" class="card">
       <h2>SSH / SCP destination</h2>
@@ -586,6 +865,103 @@ onMounted(load)
       </div>
     </section>
 
+    <!-- OCR tab — cloud OCR provider settings for screenshot text extraction. -->
+    <section v-if="props.tab === 'ocr'" class="card">
+      <h2>文字提取</h2>
+      <div class="grid">
+        <label class="field full">
+          <span>Provider</span>
+          <select v-model="config.ocr.activeProvider">
+            <option
+              v-for="provider in ocrProviderOptions"
+              :key="provider.id"
+              :value="provider.id"
+            >
+              {{ provider.label }}
+            </option>
+          </select>
+        </label>
+        <label class="field full">
+          <span>Endpoint *</span>
+          <input
+            v-model="activeOCRProvider.endpoint"
+            placeholder="https://ocr-api.cn-hangzhou.aliyuncs.com"
+            spellcheck="false"
+          />
+        </label>
+        <label class="field">
+          <span>AccessKey ID *</span>
+          <input v-model="activeOCRProvider.accessKeyId" spellcheck="false" />
+        </label>
+        <label class="field">
+          <span>AccessKey Secret *</span>
+          <input v-model="activeOCRProvider.accessKeySecret" type="password" />
+        </label>
+        <label
+          v-if="config.ocr.activeProvider === 'volcengine'"
+          class="field"
+        >
+          <span>Region *</span>
+          <input
+            v-model="activeOCRProvider.region"
+            placeholder="cn-north-1"
+            spellcheck="false"
+          />
+        </label>
+        <label
+          v-if="config.ocr.activeProvider === 'volcengine'"
+          class="field"
+        >
+          <span>Service *</span>
+          <input
+            v-model="activeOCRProvider.service"
+            placeholder="cv"
+            spellcheck="false"
+          />
+        </label>
+        <label class="field">
+          <span>Action *</span>
+          <input
+            v-model="activeOCRProvider.action"
+            placeholder="RecognizeGeneral / OCRNormal"
+            spellcheck="false"
+          />
+        </label>
+        <label class="field">
+          <span>Version *</span>
+          <input
+            v-model="activeOCRProvider.version"
+            placeholder="2021-07-07 / 2020-08-26"
+            spellcheck="false"
+          />
+        </label>
+        <label class="field">
+          <span>Timeout (sec)</span>
+          <input
+            v-model.number="activeOCRProvider.timeoutSecs"
+            type="number"
+            min="5"
+            max="120"
+            placeholder="30"
+          />
+        </label>
+      </div>
+      <p v-if="config.ocr.activeProvider === 'aliyun'" class="hint">
+        阿里云默认使用 OCR API 的 <code>RecognizeGeneral</code>，请求体为截图
+        PNG 原始数据，并使用 ACS3-HMAC-SHA256 签名。
+      </p>
+      <p v-else class="hint">
+        火山引擎默认使用视觉智能的 <code>OCRNormal</code>，截图以
+        <code>image_base64</code> 发送，并使用 Region/Service 参与签名。
+      </p>
+
+      <div class="actions">
+        <button class="btn primary" :disabled="saving" @click="save">
+          {{ saving ? 'Saving…' : 'Save' }}
+        </button>
+      </div>
+    </section>
+
     <transition name="fade">
       <div
         v-if="message"

frontend/tests/annotationGeometry.test.ts

@@ -0,0 +1,65 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { preserveAnnotationScreenPositions } from '../src/utils/annotationGeometry.ts'
+
+test('keeps annotation points at the same screen position when the origin moves', () => {
+  const annotations = [
+    { points: [{ x: 30, y: 40 }, { x: 80, y: 90 }] },
+    { points: [{ x: 12, y: 18 }] },
+  ]
+
+  preserveAnnotationScreenPositions(
+    annotations,
+    { x: 100, y: 200 },
+    { x: 125, y: 230 }
+  )
+
+  assert.deepEqual(annotations, [
+    { points: [{ x: 5, y: 10 }, { x: 55, y: 60 }] },
+    { points: [{ x: -13, y: -12 }] },
+  ])
+  assert.deepEqual(
+    annotations[0].points.map((point) => ({
+      x: 125 + point.x,
+      y: 230 + point.y,
+    })),
+    [{ x: 130, y: 240 }, { x: 180, y: 290 }]
+  )
+})
+
+test('does not move annotations when only the right or bottom edge changes', () => {
+  const annotations = [{ points: [{ x: 30, y: 40 }] }]
+
+  preserveAnnotationScreenPositions(
+    annotations,
+    { x: 100, y: 200 },
+    { x: 100, y: 200 }
+  )
+
+  assert.deepEqual(annotations, [{ points: [{ x: 30, y: 40 }] }])
+})
+
+test('preserves screen positions across repeated drags and an edge crossover', () => {
+  const annotations = [{ points: [{ x: 50, y: 60 }] }]
+
+  preserveAnnotationScreenPositions(
+    annotations,
+    { x: 100, y: 100 },
+    { x: 140, y: 130 }
+  )
+  preserveAnnotationScreenPositions(
+    annotations,
+    { x: 140, y: 130 },
+    { x: 300, y: 150 }
+  )
+
+  assert.deepEqual(annotations, [{ points: [{ x: -150, y: 10 }] }])
+  assert.deepEqual(
+    {
+      x: 300 + annotations[0].points[0].x,
+      y: 150 + annotations[0].points[0].y,
+    },
+    { x: 150, y: 160 }
+  )
+})

frontend/wailsjs/go/main/App.d.ts

@@ -17,6 +17,10 @@ export function CopyNativeRegionImage(arg1:main.CaptureResult):Promise<void>;
 
 export function CopyRegionImage(arg1:main.CaptureResult):Promise<void>;
 
+export function ExtractTextNativeRegion(arg1:main.CaptureResult):Promise<void>;
+
+export function ExtractTextRegion(arg1:main.CaptureResult):Promise<void>;
+
 export function GetConfig():Promise<domain.AppConfig>;
 
 export function QuitApp():Promise<void>;
@@ -43,4 +47,10 @@ export function SummarizeRegion(arg1:main.CaptureResult):Promise<void>;
 
 export function TestConnection(arg1:domain.S3Config):Promise<void>;
 
+export function TestFTPConnection(arg1:domain.FTPConfig):Promise<void>;
+
 export function TestSSHConnection(arg1:domain.SSHConfig):Promise<void>;
+
+export function UploadNativeRegionToFTP(arg1:main.CaptureResult):Promise<void>;
+
+export function UploadRegionToFTP(arg1:main.CaptureResult):Promise<void>;

frontend/wailsjs/go/main/App.js

@@ -30,6 +30,14 @@ export function CopyRegionImage(arg1) {
   return window['go']['main']['App']['CopyRegionImage'](arg1);
 }
 
+export function ExtractTextNativeRegion(arg1) {
+  return window['go']['main']['App']['ExtractTextNativeRegion'](arg1);
+}
+
+export function ExtractTextRegion(arg1) {
+  return window['go']['main']['App']['ExtractTextRegion'](arg1);
+}
+
 export function GetConfig() {
   return window['go']['main']['App']['GetConfig']();
 }
@@ -82,6 +90,18 @@ export function TestConnection(arg1) {
   return window['go']['main']['App']['TestConnection'](arg1);
 }
 
+export function TestFTPConnection(arg1) {
+  return window['go']['main']['App']['TestFTPConnection'](arg1);
+}
+
 export function TestSSHConnection(arg1) {
   return window['go']['main']['App']['TestSSHConnection'](arg1);
 }
+
+export function UploadNativeRegionToFTP(arg1) {
+  return window['go']['main']['App']['UploadNativeRegionToFTP'](arg1);
+}
+
+export function UploadRegionToFTP(arg1) {
+  return window['go']['main']['App']['UploadRegionToFTP'](arg1);
+}

frontend/wailsjs/go/models.ts

@@ -18,6 +18,9 @@ export namespace application {
 	    tool: string;
 	    color: string;
 	    points: Point[];
+	    text?: string;
+	    strokeWidth?: number;
+	    fontSize?: number;
 	
 	    static createFrom(source: any = {}) {
 	        return new Annotation(source);
@@ -28,6 +31,9 @@ export namespace application {
 	        this.tool = source["tool"];
 	        this.color = source["color"];
 	        this.points = this.convertValues(source["points"], Point);
+	        this.text = source["text"];
+	        this.strokeWidth = source["strokeWidth"];
+	        this.fontSize = source["fontSize"];
 	    }
 	
 		convertValues(a: any, classs: any, asMap: boolean = false): any {
@@ -53,6 +59,66 @@ export namespace application {
 
 export namespace domain {
 	
+	export class OCRProviderConfig {
+	    label: string;
+	    endpoint: string;
+	    accessKeyId: string;
+	    accessKeySecret: string;
+	    region: string;
+	    service: string;
+	    action: string;
+	    version: string;
+	    timeoutSecs: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new OCRProviderConfig(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.label = source["label"];
+	        this.endpoint = source["endpoint"];
+	        this.accessKeyId = source["accessKeyId"];
+	        this.accessKeySecret = source["accessKeySecret"];
+	        this.region = source["region"];
+	        this.service = source["service"];
+	        this.action = source["action"];
+	        this.version = source["version"];
+	        this.timeoutSecs = source["timeoutSecs"];
+	    }
+	}
+	export class OCRConfig {
+	    activeProvider: string;
+	    providers: Record<string, OCRProviderConfig>;
+	
+	    static createFrom(source: any = {}) {
+	        return new OCRConfig(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.activeProvider = source["activeProvider"];
+	        this.providers = this.convertValues(source["providers"], OCRProviderConfig, true);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
 	export class LLMProviderConfig {
 	    label: string;
 	    baseUrl: string;
@@ -61,6 +127,7 @@ export namespace domain {
 	    maxTokens: number;
 	    temperature: number;
 	    timeoutSecs: number;
+	    maxInlineBytes: number;
 	
 	    static createFrom(source: any = {}) {
 	        return new LLMProviderConfig(source);
@@ -75,6 +142,7 @@ export namespace domain {
 	        this.maxTokens = source["maxTokens"];
 	        this.temperature = source["temperature"];
 	        this.timeoutSecs = source["timeoutSecs"];
+	        this.maxInlineBytes = source["maxInlineBytes"];
 	    }
 	}
 	export class LLMConfig {
@@ -111,6 +179,38 @@ export namespace domain {
 		    return a;
 		}
 	}
+	export class FTPConfig {
+	    protocol: string;
+	    host: string;
+	    port: number;
+	    user: string;
+	    authMethod: string;
+	    password: string;
+	    rootDirectory: string;
+	    pathPrefix: string;
+	    strictHostKey: boolean;
+	    knownHostsPath: string;
+	    connectTimeoutSecs: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new FTPConfig(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.protocol = source["protocol"];
+	        this.host = source["host"];
+	        this.port = source["port"];
+	        this.user = source["user"];
+	        this.authMethod = source["authMethod"];
+	        this.password = source["password"];
+	        this.rootDirectory = source["rootDirectory"];
+	        this.pathPrefix = source["pathPrefix"];
+	        this.strictHostKey = source["strictHostKey"];
+	        this.knownHostsPath = source["knownHostsPath"];
+	        this.connectTimeoutSecs = source["connectTimeoutSecs"];
+	    }
+	}
 	export class SSHConfig {
 	    host: string;
 	    port: number;
@@ -170,7 +270,9 @@ export namespace domain {
 	    theme: string;
 	    s3: S3Config;
 	    ssh: SSHConfig;
+	    ftp: FTPConfig;
 	    llm: LLMConfig;
+	    ocr: OCRConfig;
 	
 	    static createFrom(source: any = {}) {
 	        return new AppConfig(source);
@@ -182,7 +284,9 @@ export namespace domain {
 	        this.theme = source["theme"];
 	        this.s3 = this.convertValues(source["s3"], S3Config);
 	        this.ssh = this.convertValues(source["ssh"], SSHConfig);
+	        this.ftp = this.convertValues(source["ftp"], FTPConfig);
 	        this.llm = this.convertValues(source["llm"], LLMConfig);
+	        this.ocr = this.convertValues(source["ocr"], OCRConfig);
 	    }
 	
 		convertValues(a: any, classs: any, asMap: boolean = false): any {
@@ -207,6 +311,9 @@ export namespace domain {
 	
 	
 	
+	
+	
+
 }
 
 export namespace main {

go.mod

@@ -7,11 +7,14 @@ require (
 	github.com/aws/aws-sdk-go-v2 v1.30.3
 	github.com/aws/aws-sdk-go-v2/credentials v1.17.27
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.58.2
+	github.com/jlaffaye/ftp v0.2.0
 	github.com/kbinani/screenshot v0.0.0-20230812210009-b87d31814237
+	github.com/pkg/sftp v1.13.10
 	github.com/wailsapp/wails/v2 v2.12.0
 	golang.design/x/clipboard v0.7.0
 	golang.design/x/hotkey v0.4.1
-	golang.org/x/crypto v0.33.0
+	golang.org/x/crypto v0.41.0
+	golang.org/x/image v0.12.0
 )
 
 require (
@@ -31,8 +34,11 @@ require (
 	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e // indirect
 	github.com/jezek/xgb v1.1.0 // indirect
+	github.com/kr/fs v0.1.0 // indirect
 	github.com/labstack/echo/v4 v4.13.3 // indirect
 	github.com/labstack/gommon v0.4.2 // indirect
 	github.com/leaanthony/go-ansi-parser v1.6.1 // indirect
@@ -52,9 +58,8 @@ require (
 	github.com/wailsapp/go-webview2 v1.0.22 // indirect
 	github.com/wailsapp/mimetype v1.4.1 // indirect
 	golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 // indirect
-	golang.org/x/image v0.12.0 // indirect
 	golang.org/x/mobile v0.0.0-20230301163155-e0f57694e12c // indirect
-	golang.org/x/net v0.35.0 // indirect
-	golang.org/x/sys v0.30.0 // indirect
-	golang.org/x/text v0.22.0 // indirect
+	golang.org/x/net v0.42.0 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
 )

go.sum

@@ -41,12 +41,20 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
+github.com/hashicorp/go-multierror v1.1.1 h1:H5DkEtf6CXdFp0N0Em5UCwQpXMWke8IA0+lD48awMYo=
+github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
 github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e h1:Q3+PugElBCf4PFpxhErSzU3/PY5sFL5Z6rfv4AbGAck=
 github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e/go.mod h1:alcuEEnZsY1WQsagKhZDsoPCRoOijYqhZvPwLG0kzVs=
 github.com/jezek/xgb v1.1.0 h1:wnpxJzP1+rkbGclEkmwpVFQWpuE2PUGNUzP8SbfFobk=
 github.com/jezek/xgb v1.1.0/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
+github.com/jlaffaye/ftp v0.2.0 h1:lXNvW7cBu7R/68bknOX3MrRIIqZ61zELs1P2RAiA3lg=
+github.com/jlaffaye/ftp v0.2.0/go.mod h1:is2Ds5qkhceAPy2xD6RLI6hmp/qysSoymZ+Z2uTnspI=
 github.com/kbinani/screenshot v0.0.0-20230812210009-b87d31814237 h1:YOp8St+CM/AQ9Vp4XYm4272E77MptJDHkwypQHIRl9Q=
 github.com/kbinani/screenshot v0.0.0-20230812210009-b87d31814237/go.mod h1:e7qQlOY68wOz4b82D7n+DdaptZAi+SHW0+yKiWZzEYE=
+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/labstack/echo/v4 v4.13.3 h1:pwhpCPrTl5qry5HRdM5FwdXnhXSLSY+WE+YQSeCaafY=
 github.com/labstack/echo/v4 v4.13.3/go.mod h1:o90YNEeQWjDozo584l7AwhJMHN0bOC4tAfg+Xox9q5g=
 github.com/labstack/gommon v0.4.2 h1:F8qTUNXgG1+6WQmqoUWnz8WiEU60mXVVw0P4ht1WRA0=
@@ -75,6 +83,8 @@ github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmd
 github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/sftp v1.13.10 h1:+5FbKNTe5Z9aspU88DPIKJ9z2KZoaGCu6Sr6kKR/5mU=
+github.com/pkg/sftp v1.13.10/go.mod h1:bJ1a7uDhrX/4OII+agvy28lzRvQrmIQuaHrcI1HbeGA=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
@@ -106,8 +116,8 @@ golang.design/x/mainthread v0.3.0/go.mod h1:vYX7cF2b3pTJMGM/hc13NmN6kblKnf4/IyvH
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/crypto v0.33.0 h1:IOBPskki6Lysi0lo9qQvbxiQ+FvsCC/YWOecCHAixus=
-golang.org/x/crypto v0.33.0/go.mod h1:bVdXmD7IV/4GdElGPozy6U7lWdRXA4qyRVGJV57uQ5M=
+golang.org/x/crypto v0.41.0 h1:WKYxWedPGCTVVl5+WHSSrOBT0O8lx32+zxmHxijgXp4=
+golang.org/x/crypto v0.41.0/go.mod h1:pO5AFd7FA68rFak7rOAGVuygIISepHftHnr8dr6+sUc=
 golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 h1:estk1glOnSVeJ9tdEZZc5mAMDZk5lNJNyJ6DvrBkTEU=
 golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56/go.mod h1:JhuoJpWY28nO4Vef9tZUw9qufEGTyX1+7lmHxV5q5G4=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
@@ -126,8 +136,8 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210505024714-0287a6fb4125/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
-golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
-golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
+golang.org/x/net v0.42.0 h1:jzkYrhi3YQWD6MLBJcsklgQsoAcw89EcZbJw8Z614hs=
+golang.org/x/net v0.42.0/go.mod h1:FF1RA5d3u7nAYA4z2TkclSCKh68eSXtiFwcWQpPXdt8=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -144,21 +154,21 @@ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
-golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
+golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
-golang.org/x/term v0.29.0 h1:L6pJp37ocefwRRtYPKSWOWzOtWSxVajvz2ldH/xi3iU=
-golang.org/x/term v0.29.0/go.mod h1:6bl4lRlvVuDgSf3179VpIxBF0o10JUpXWOnI7nErv7s=
+golang.org/x/term v0.34.0 h1:O/2T7POpk0ZZ7MAzMeWFSg6S5IpWd/RXDlM9hgM3DR4=
+golang.org/x/term v0.34.0/go.mod h1:5jC53AEywhIVebHgPVeg0mj8OD3VO9OzclacVrqpaAw=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
-golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
+golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
+golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=

internal/application/annotation.go

@@ -8,8 +8,15 @@ import (
 	"image/draw"
 	"image/png"
 	"math"
+	"os"
 	"strconv"
 	"strings"
+	"sync"
+
+	xfont "golang.org/x/image/font"
+	"golang.org/x/image/font/basicfont"
+	"golang.org/x/image/font/opentype"
+	"golang.org/x/image/math/fixed"
 )
 
 // Annotation describes a user-drawn mark relative to the selected screenshot.
@@ -18,6 +25,9 @@ type Annotation struct {
 	Tool        string  `json:"tool"`
 	Color       string  `json:"color"`
 	Points      []Point `json:"points"`
+	Text        string  `json:"text,omitempty"`
+	StrokeWidth float64 `json:"strokeWidth,omitempty"`
+	FontSize    float64 `json:"fontSize,omitempty"`
 }
 
 type Point struct {
@@ -27,12 +37,22 @@ type Point struct {
 
 // ApplyAnnotations decodes a PNG, draws all annotations, and re-encodes it.
 func ApplyAnnotations(pngBytes []byte, annotations []Annotation, scale float64) ([]byte, error) {
+	return ApplyAnnotationsWithScale(pngBytes, annotations, scale, scale)
+}
+
+// ApplyAnnotationsWithScale decodes a PNG, draws all annotations using the
+// actual device-pixel scale of the captured image, and re-encodes it.
+func ApplyAnnotationsWithScale(pngBytes []byte, annotations []Annotation, scaleX, scaleY float64) ([]byte, error) {
 	if len(annotations) == 0 {
 		return pngBytes, nil
 	}
-	if scale <= 0 {
-		scale = 1
+	if scaleX <= 0 {
+		scaleX = 1
 	}
+	if scaleY <= 0 {
+		scaleY = scaleX
+	}
+	strokeScale := math.Max(scaleX, scaleY)
 
 	src, err := png.Decode(bytes.NewReader(pngBytes))
 	if err != nil {
@@ -47,14 +67,28 @@ func ApplyAnnotations(pngBytes []byte, annotations []Annotation, scale float64)
 		if err != nil {
 			c = color.RGBA{R: 59, G: 130, B: 246, A: 255}
 		}
-		width := int(math.Max(2, math.Round(3*scale)))
+		strokeWidth := ann.StrokeWidth
+		if strokeWidth <= 0 {
+			strokeWidth = 3
+		}
+		width := int(math.Max(1, math.Round(strokeWidth*strokeScale)))
 		switch ann.Tool {
 		case "pen":
-			drawPolyline(dst, ann.Points, scale, width, c)
+			drawPolyline(dst, ann.Points, scaleX, scaleY, width, c)
+		case "line":
+			drawStraightLine(dst, ann.Points, scaleX, scaleY, width, c)
+		case "arrow":
+			drawArrow(dst, ann.Points, scaleX, scaleY, width, c)
 		case "rect":
-			drawRectOutline(dst, ann.Points, scale, width, c)
+			drawRectOutline(dst, ann.Points, scaleX, scaleY, width, c)
 		case "ellipse":
-			drawEllipseOutline(dst, ann.Points, scale, width, c)
+			drawEllipseOutline(dst, ann.Points, scaleX, scaleY, width, c)
+		case "text":
+			drawTextAnnotation(dst, ann, scaleX, scaleY, c)
+		case "mosaic-brush":
+			applyMosaicBrush(dst, ann.Points, scaleX, scaleY, width)
+		case "mosaic-rect":
+			applyMosaicRect(dst, ann.Points, scaleX, scaleY)
 		}
 	}
 
@@ -65,6 +99,121 @@ func ApplyAnnotations(pngBytes []byte, annotations []Annotation, scale float64)
 	return buf.Bytes(), nil
 }
 
+func drawStraightLine(img *image.RGBA, points []Point, scaleX, scaleY float64, width int, c color.RGBA) {
+	if len(points) < 2 {
+		return
+	}
+	drawLine(img, scalePoint(points[0], scaleX, scaleY), scalePoint(points[len(points)-1], scaleX, scaleY), width, c)
+}
+
+func drawArrow(img *image.RGBA, points []Point, scaleX, scaleY float64, width int, c color.RGBA) {
+	if len(points) < 2 {
+		return
+	}
+	start := scalePoint(points[0], scaleX, scaleY)
+	end := scalePoint(points[len(points)-1], scaleX, scaleY)
+	dx, dy := end.X-start.X, end.Y-start.Y
+	length := math.Hypot(dx, dy)
+	if length < 1 {
+		return
+	}
+	drawLine(img, start, end, width, c)
+	headLength := math.Min(length*0.45, math.Max(10*math.Max(scaleX, scaleY), float64(width)*4))
+	angle := math.Atan2(dy, dx)
+	spread := math.Pi / 6
+	left := Point{X: end.X - headLength*math.Cos(angle-spread), Y: end.Y - headLength*math.Sin(angle-spread)}
+	right := Point{X: end.X - headLength*math.Cos(angle+spread), Y: end.Y - headLength*math.Sin(angle+spread)}
+	drawLine(img, end, left, width, c)
+	drawLine(img, end, right, width, c)
+}
+
+const mosaicBlockSize = 10
+
+func applyMosaicBrush(img *image.RGBA, points []Point, scaleX, scaleY float64, width int) {
+	if len(points) == 0 {
+		return
+	}
+	mask := image.NewAlpha(img.Bounds())
+	maskColor := color.RGBA{A: 255}
+	if len(points) == 1 {
+		drawDotMask(mask, scalePoint(points[0], scaleX, scaleY), width, maskColor)
+	} else {
+		for i := 1; i < len(points); i++ {
+			drawMaskLine(mask, scalePoint(points[i-1], scaleX, scaleY), scalePoint(points[i], scaleX, scaleY), width, maskColor)
+		}
+	}
+	applyPixelation(img, img.Bounds(), mask)
+}
+
+func applyMosaicRect(img *image.RGBA, points []Point, scaleX, scaleY float64) {
+	if len(points) < 2 {
+		return
+	}
+	a := scalePoint(points[0], scaleX, scaleY)
+	b := scalePoint(points[len(points)-1], scaleX, scaleY)
+	x1, x2 := ordered(a.X, b.X)
+	y1, y2 := ordered(a.Y, b.Y)
+	r := image.Rect(int(math.Floor(x1)), int(math.Floor(y1)), int(math.Ceil(x2)), int(math.Ceil(y2))).Intersect(img.Bounds())
+	applyPixelation(img, r, nil)
+}
+
+func applyPixelation(img *image.RGBA, region image.Rectangle, mask *image.Alpha) {
+	if region.Empty() {
+		return
+	}
+	for y := region.Min.Y; y < region.Max.Y; y += mosaicBlockSize {
+		for x := region.Min.X; x < region.Max.X; x += mosaicBlockSize {
+			block := image.Rect(x, y, min(x+mosaicBlockSize, region.Max.X), min(y+mosaicBlockSize, region.Max.Y))
+			var r, g, b, a, count uint64
+			for py := block.Min.Y; py < block.Max.Y; py++ {
+				for px := block.Min.X; px < block.Max.X; px++ {
+					c := img.RGBAAt(px, py)
+					r += uint64(c.R)
+					g += uint64(c.G)
+					b += uint64(c.B)
+					a += uint64(c.A)
+					count++
+				}
+			}
+			if count == 0 {
+				continue
+			}
+			avg := color.RGBA{uint8(r / count), uint8(g / count), uint8(b / count), uint8(a / count)}
+			for py := block.Min.Y; py < block.Max.Y; py++ {
+				for px := block.Min.X; px < block.Max.X; px++ {
+					if mask == nil || mask.AlphaAt(px, py).A > 0 {
+						img.SetRGBA(px, py, avg)
+					}
+				}
+			}
+		}
+	}
+}
+
+func drawMaskLine(mask *image.Alpha, a, b Point, width int, c color.RGBA) {
+	dx, dy := b.X-a.X, b.Y-a.Y
+	steps := int(math.Max(math.Abs(dx), math.Abs(dy)))
+	if steps == 0 {
+		drawDotMask(mask, a, width, c)
+		return
+	}
+	for i := 0; i <= steps; i++ {
+		t := float64(i) / float64(steps)
+		drawDotMask(mask, Point{X: a.X + dx*t, Y: a.Y + dy*t}, width, c)
+	}
+}
+
+func drawDotMask(mask *image.Alpha, p Point, width int, c color.RGBA) {
+	radius := float64(width) / 2
+	for y := int(math.Floor(p.Y - radius)); y <= int(math.Ceil(p.Y+radius)); y++ {
+		for x := int(math.Floor(p.X - radius)); x <= int(math.Ceil(p.X+radius)); x++ {
+			if image.Pt(x, y).In(mask.Bounds()) && math.Hypot(float64(x)-p.X, float64(y)-p.Y) <= radius {
+				mask.SetAlpha(x, y, color.Alpha{A: c.A})
+			}
+		}
+	}
+}
+
 func parseHexColor(hex string) (color.RGBA, error) {
 	value := strings.TrimPrefix(strings.TrimSpace(hex), "#")
 	if len(value) != 6 {
@@ -82,22 +231,22 @@ func parseHexColor(hex string) (color.RGBA, error) {
 	}, nil
 }
 
-func drawPolyline(img *image.RGBA, points []Point, scale float64, width int, c color.RGBA) {
+func drawPolyline(img *image.RGBA, points []Point, scaleX, scaleY float64, width int, c color.RGBA) {
 	if len(points) == 1 {
-		drawDot(img, scalePoint(points[0], scale), width, c)
+		drawDot(img, scalePoint(points[0], scaleX, scaleY), width, c)
 		return
 	}
 	for i := 1; i < len(points); i++ {
-		drawLine(img, scalePoint(points[i-1], scale), scalePoint(points[i], scale), width, c)
+		drawLine(img, scalePoint(points[i-1], scaleX, scaleY), scalePoint(points[i], scaleX, scaleY), width, c)
 	}
 }
 
-func drawRectOutline(img *image.RGBA, points []Point, scale float64, width int, c color.RGBA) {
+func drawRectOutline(img *image.RGBA, points []Point, scaleX, scaleY float64, width int, c color.RGBA) {
 	if len(points) < 2 {
 		return
 	}
-	a := scalePoint(points[0], scale)
-	b := scalePoint(points[len(points)-1], scale)
+	a := scalePoint(points[0], scaleX, scaleY)
+	b := scalePoint(points[len(points)-1], scaleX, scaleY)
 	x1, x2 := ordered(a.X, b.X)
 	y1, y2 := ordered(a.Y, b.Y)
 	drawLine(img, Point{X: x1, Y: y1}, Point{X: x2, Y: y1}, width, c)
@@ -106,12 +255,12 @@ func drawRectOutline(img *image.RGBA, points []Point, scale float64, width int,
 	drawLine(img, Point{X: x1, Y: y2}, Point{X: x1, Y: y1}, width, c)
 }
 
-func drawEllipseOutline(img *image.RGBA, points []Point, scale float64, width int, c color.RGBA) {
+func drawEllipseOutline(img *image.RGBA, points []Point, scaleX, scaleY float64, width int, c color.RGBA) {
 	if len(points) < 2 {
 		return
 	}
-	a := scalePoint(points[0], scale)
-	b := scalePoint(points[len(points)-1], scale)
+	a := scalePoint(points[0], scaleX, scaleY)
+	b := scalePoint(points[len(points)-1], scaleX, scaleY)
 	x1, x2 := ordered(a.X, b.X)
 	y1, y2 := ordered(a.Y, b.Y)
 	rx := (x2 - x1) / 2
@@ -170,8 +319,8 @@ func drawDot(img *image.RGBA, p Point, width int, c color.RGBA) {
 	}
 }
 
-func scalePoint(p Point, scale float64) Point {
-	return Point{X: p.X * scale, Y: p.Y * scale}
+func scalePoint(p Point, scaleX, scaleY float64) Point {
+	return Point{X: p.X * scaleX, Y: p.Y * scaleY}
 }
 
 func ordered(a, b float64) (float64, float64) {
@@ -180,3 +329,94 @@ func ordered(a, b float64) (float64, float64) {
 	}
 	return b, a
 }
+
+func drawTextAnnotation(img *image.RGBA, ann Annotation, scaleX, scaleY float64, c color.RGBA) {
+	if len(ann.Points) == 0 {
+		return
+	}
+	text := strings.TrimSpace(ann.Text)
+	if text == "" {
+		return
+	}
+	fontSize := ann.FontSize
+	if fontSize <= 0 {
+		fontSize = 20
+	}
+	face := annotationFontFace(fontSize * scaleY)
+	if face == nil {
+		face = basicfont.Face7x13
+	}
+
+	origin := scalePoint(ann.Points[0], scaleX, scaleY)
+	metrics := face.Metrics()
+	lineHeight := metrics.Height
+	if lineHeight <= 0 {
+		lineHeight = fixed.I(int(math.Ceil(fontSize * 1.2 * scaleY)))
+	}
+	d := &xfont.Drawer{
+		Dst:  img,
+		Src:  image.NewUniform(c),
+		Face: face,
+	}
+	baselineY := fixed.I(int(math.Round(origin.Y))) + metrics.Ascent
+	x := fixed.I(int(math.Round(origin.X)))
+	for _, line := range strings.Split(text, "\n") {
+		line = strings.TrimRight(line, "\r")
+		if line != "" {
+			d.Dot = fixed.Point26_6{X: x, Y: baselineY}
+			d.DrawString(line)
+		}
+		baselineY += lineHeight
+	}
+}
+
+var (
+	annotationFontOnce sync.Once
+	annotationFont     *opentype.Font
+)
+
+func annotationFontFace(size float64) xfont.Face {
+	if size <= 0 {
+		size = 20
+	}
+	annotationFontOnce.Do(func() {
+		annotationFont = loadAnnotationFont()
+	})
+	if annotationFont == nil {
+		return basicfont.Face7x13
+	}
+	face, err := opentype.NewFace(annotationFont, &opentype.FaceOptions{
+		Size:    size,
+		DPI:     72,
+		Hinting: xfont.HintingFull,
+	})
+	if err != nil {
+		return basicfont.Face7x13
+	}
+	return face
+}
+
+func loadAnnotationFont() *opentype.Font {
+	paths := []string{
+		"/System/Library/Fonts/Supplemental/Arial Unicode.ttf",
+		"/Library/Fonts/Arial Unicode.ttf",
+		"/System/Library/Fonts/Hiragino Sans GB.ttc",
+		"/System/Library/Fonts/PingFang.ttc",
+		"/System/Library/Fonts/Helvetica.ttc",
+	}
+	for _, path := range paths {
+		data, err := os.ReadFile(path)
+		if err != nil {
+			continue
+		}
+		if collection, err := opentype.ParseCollection(data); err == nil && collection.NumFonts() > 0 {
+			if font, err := collection.Font(0); err == nil {
+				return font
+			}
+		}
+		if font, err := opentype.Parse(data); err == nil {
+			return font
+		}
+	}
+	return nil
+}

internal/application/annotation_test.go

@@ -51,3 +51,230 @@ func TestApplyAnnotationsNoAnnotationsReturnsOriginalBytes(t *testing.T) {
 		t.Fatalf("expected original bytes")
 	}
 }
+
+func TestApplyAnnotationsDrawsTextIntoPNG(t *testing.T) {
+	src := image.NewRGBA(image.Rect(0, 0, 120, 80))
+	draw.Draw(src, src.Bounds(), &image.Uniform{C: color.White}, image.Point{}, draw.Src)
+
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, src); err != nil {
+		t.Fatalf("encode source: %v", err)
+	}
+
+	out, err := ApplyAnnotations(buf.Bytes(), []Annotation{
+		{
+			Tool:  "text",
+			Color: "#ef4444",
+			Points: []Point{
+				{X: 10, Y: 10},
+			},
+			Text: "T",
+		},
+	}, 1)
+	if err != nil {
+		t.Fatalf("apply annotations: %v", err)
+	}
+
+	img, err := png.Decode(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode output: %v", err)
+	}
+	found := false
+	for y := 8; y < 40 && !found; y++ {
+		for x := 8; x < 40; x++ {
+			got := color.RGBAModel.Convert(img.At(x, y)).(color.RGBA)
+			if got.R > 180 && got.G < 180 && got.B < 180 {
+				found = true
+				break
+			}
+		}
+	}
+	if !found {
+		t.Fatalf("expected red text pixels near annotation point")
+	}
+}
+
+func TestApplyAnnotationsWithScaleDrawsTextAtDevicePosition(t *testing.T) {
+	src := image.NewRGBA(image.Rect(0, 0, 220, 120))
+	draw.Draw(src, src.Bounds(), &image.Uniform{C: color.White}, image.Point{}, draw.Src)
+
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, src); err != nil {
+		t.Fatalf("encode source: %v", err)
+	}
+
+	out, err := ApplyAnnotationsWithScale(buf.Bytes(), []Annotation{
+		{
+			Tool:     "text",
+			Color:    "#ef4444",
+			Points:   []Point{{X: 50, Y: 20}},
+			Text:     "T",
+			FontSize: 20,
+		},
+	}, 2, 2)
+	if err != nil {
+		t.Fatalf("apply annotations: %v", err)
+	}
+
+	img, err := png.Decode(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode output: %v", err)
+	}
+	minX := 999
+	found := false
+	for y := 0; y < img.Bounds().Dy(); y++ {
+		for x := 0; x < img.Bounds().Dx(); x++ {
+			got := color.RGBAModel.Convert(img.At(x, y)).(color.RGBA)
+			if got.R > 180 && got.G < 180 && got.B < 180 {
+				found = true
+				if x < minX {
+					minX = x
+				}
+			}
+		}
+	}
+	if !found {
+		t.Fatalf("expected red text pixels")
+	}
+	if minX < 90 {
+		t.Fatalf("expected text to be drawn near scaled x=100, min red x=%d", minX)
+	}
+}
+
+func TestApplyAnnotationsUsesStrokeWidth(t *testing.T) {
+	src := image.NewRGBA(image.Rect(0, 0, 80, 80))
+	draw.Draw(src, src.Bounds(), &image.Uniform{C: color.White}, image.Point{}, draw.Src)
+
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, src); err != nil {
+		t.Fatalf("encode source: %v", err)
+	}
+
+	out, err := ApplyAnnotations(buf.Bytes(), []Annotation{
+		{
+			Tool:        "rect",
+			Color:       "#ef4444",
+			Points:      []Point{{X: 20, Y: 20}, {X: 60, Y: 60}},
+			StrokeWidth: 8,
+		},
+	}, 1)
+	if err != nil {
+		t.Fatalf("apply annotations: %v", err)
+	}
+
+	img, err := png.Decode(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode output: %v", err)
+	}
+	got := color.RGBAModel.Convert(img.At(20, 24)).(color.RGBA)
+	if got.R < 180 || got.G > 180 || got.B > 180 {
+		t.Fatalf("expected thick rectangle stroke to cover y=24, got %#v", got)
+	}
+}
+
+func TestApplyAnnotationsPixelatesMosaicRectangle(t *testing.T) {
+	src := image.NewRGBA(image.Rect(0, 0, 40, 30))
+	for y := 0; y < 30; y++ {
+		for x := 0; x < 40; x++ {
+			src.SetRGBA(x, y, color.RGBA{R: uint8(x * 6), G: uint8(y * 8), B: uint8((x + y) * 3), A: 255})
+		}
+	}
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, src); err != nil {
+		t.Fatalf("encode source: %v", err)
+	}
+	out, err := ApplyAnnotations(buf.Bytes(), []Annotation{{
+		Tool: "mosaic-rect", Points: []Point{{X: 10, Y: 5}, {X: 30, Y: 25}},
+	}}, 1)
+	if err != nil {
+		t.Fatalf("apply annotations: %v", err)
+	}
+	img, err := png.Decode(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode output: %v", err)
+	}
+	if img.At(12, 7) != img.At(18, 13) {
+		t.Fatalf("expected pixels in one mosaic block to share a color")
+	}
+	if img.At(5, 5) != src.At(5, 5) {
+		t.Fatalf("expected pixels outside mosaic rectangle to remain unchanged")
+	}
+}
+
+func TestApplyAnnotationsPixelatesOnlyMosaicBrushStroke(t *testing.T) {
+	src := image.NewRGBA(image.Rect(0, 0, 50, 30))
+	for y := 0; y < 30; y++ {
+		for x := 0; x < 50; x++ {
+			src.SetRGBA(x, y, color.RGBA{R: uint8(x * 5), G: uint8(y * 8), A: 255})
+		}
+	}
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, src); err != nil {
+		t.Fatalf("encode source: %v", err)
+	}
+	out, err := ApplyAnnotations(buf.Bytes(), []Annotation{{
+		Tool: "mosaic-brush", StrokeWidth: 12, Points: []Point{{X: 5, Y: 15}, {X: 45, Y: 15}},
+	}}, 1)
+	if err != nil {
+		t.Fatalf("apply annotations: %v", err)
+	}
+	img, err := png.Decode(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode output: %v", err)
+	}
+	if img.At(12, 15) == src.At(12, 15) {
+		t.Fatalf("expected brush path to be pixelated")
+	}
+	if img.At(12, 2) != src.At(12, 2) {
+		t.Fatalf("expected pixels outside brush path to remain unchanged")
+	}
+}
+
+func TestApplyAnnotationsDrawsStraightLine(t *testing.T) {
+	src := image.NewRGBA(image.Rect(0, 0, 60, 40))
+	draw.Draw(src, src.Bounds(), &image.Uniform{C: color.White}, image.Point{}, draw.Src)
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, src); err != nil {
+		t.Fatalf("encode source: %v", err)
+	}
+	out, err := ApplyAnnotations(buf.Bytes(), []Annotation{{
+		Tool: "line", Color: "#ef4444", StrokeWidth: 4,
+		Points: []Point{{X: 5, Y: 20}, {X: 50, Y: 20}},
+	}}, 1)
+	if err != nil {
+		t.Fatalf("apply annotations: %v", err)
+	}
+	img, err := png.Decode(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode output: %v", err)
+	}
+	got := color.RGBAModel.Convert(img.At(30, 20)).(color.RGBA)
+	if got.R < 180 || got.G > 180 || got.B > 180 {
+		t.Fatalf("expected red line at center, got %#v", got)
+	}
+}
+
+func TestApplyAnnotationsDrawsArrowHead(t *testing.T) {
+	src := image.NewRGBA(image.Rect(0, 0, 80, 60))
+	draw.Draw(src, src.Bounds(), &image.Uniform{C: color.White}, image.Point{}, draw.Src)
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, src); err != nil {
+		t.Fatalf("encode source: %v", err)
+	}
+	out, err := ApplyAnnotations(buf.Bytes(), []Annotation{{
+		Tool: "arrow", Color: "#3b82f6", StrokeWidth: 3,
+		Points: []Point{{X: 10, Y: 30}, {X: 60, Y: 30}},
+	}}, 1)
+	if err != nil {
+		t.Fatalf("apply annotations: %v", err)
+	}
+	img, err := png.Decode(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode output: %v", err)
+	}
+	shaft := color.RGBAModel.Convert(img.At(35, 30)).(color.RGBA)
+	head := color.RGBAModel.Convert(img.At(52, 25)).(color.RGBA)
+	if shaft.B < 180 || shaft.R > 140 || head.B < 180 || head.R > 140 {
+		t.Fatalf("expected blue arrow shaft and head, got shaft=%#v head=%#v", shaft, head)
+	}
+}

internal/application/capture_actions.go

@@ -61,6 +61,14 @@ func (s *CaptureActionsService) SaveImage(_ context.Context, pngBytes []byte, di
 		s.notifyFailure("save failed: " + err.Error())
 		return "", err
 	}
+	// Copy the saved path to the clipboard so the user can paste it right
+	// away, mirroring how the upload/summary flows copy their result. A
+	// clipboard failure must not fail the save itself.
+	if s.Clipboard != nil {
+		if err := s.Clipboard.WriteText(path); err != nil {
+			s.notifyFailure("clipboard write failed: " + err.Error())
+		}
+	}
 	if s.Notifier != nil {
 		s.Notifier.NotifySuccess(path)
 	}

internal/application/capture_ftp.go

@@ -0,0 +1,150 @@
+// capture_ftp.go — application-level FTP/SFTP upload orchestration.
+//
+// Design rationale:
+//   - FTP/SFTP returns a remote filesystem path, not necessarily a public URL,
+//     so this flow stays separate from the OSSProvider-based S3 pipeline.
+//   - A tiny uploader interface keeps protocol libraries out of the
+//     application layer and makes the upload/copy/notify sequence unit-testable.
+//   - The dated filename layout is shared with SSH/SCP while FTP-specific path
+//     validation prevents an invalid prefix from escaping the login root.
+package application
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"github.com/mmmy/snapgo/internal/domain"
+	"github.com/mmmy/snapgo/internal/infrastructure/clipboard"
+)
+
+// ftpSvcLog returns an application-layer FTP logger bound to the current
+// default slog handler.
+func ftpSvcLog() *slog.Logger { return slog.Default().With("component", "application.ftp") }
+
+// FTPUploader abstracts both FTP and SFTP adapters.
+type FTPUploader interface {
+	// Upload stores data at remoteRelPath, relative to the authenticated
+	// account's login root.
+	Upload(ctx context.Context, remoteRelPath string, data []byte) error
+}
+
+// CaptureAndFTPService wires captured PNG bytes → FTP/SFTP → clipboard →
+// notification.
+type CaptureAndFTPService struct {
+	Uploader  FTPUploader
+	Clipboard clipboard.Writer
+	Notifier  Notifier
+	Cfg       domain.FTPConfig
+}
+
+// ExecuteWithBytes uploads previously captured PNG bytes and copies a display
+// path built from the configured root directory plus the uploaded relative
+// path. RootDirectory deliberately does not affect the upload destination.
+func (s *CaptureAndFTPService) ExecuteWithBytes(ctx context.Context, pngBytes []byte) error {
+	if s.Uploader == nil {
+		s.notifyFailure("FTP/SFTP not configured")
+		return fmt.Errorf("ftp uploader is nil")
+	}
+	if len(pngBytes) == 0 {
+		s.notifyFailure("empty screenshot")
+		return fmt.Errorf("empty screenshot")
+	}
+
+	relPath, err := buildFTPRemotePath(s.Cfg.PathPrefix)
+	if err != nil {
+		s.notifyFailure(err.Error())
+		return err
+	}
+
+	protocol := normalizedFTPProtocol(s.Cfg.Protocol)
+	start := time.Now()
+	ftpSvcLog().Info("file-transfer pipeline start",
+		"protocol", protocol,
+		"host", s.Cfg.Host,
+		"user", s.Cfg.User,
+		"port", s.Cfg.Port,
+		"size", len(pngBytes),
+		"remote_path", relPath,
+		"strict_host_key", s.Cfg.StrictHostKey)
+
+	if err := s.Uploader.Upload(ctx, relPath, pngBytes); err != nil {
+		ftpSvcLog().Error("file-transfer upload failed",
+			"protocol", protocol,
+			"remote_path", relPath,
+			"elapsed", time.Since(start),
+			"err", err)
+		s.notifyFailure(strings.ToUpper(protocol) + " upload failed: " + err.Error())
+		return err
+	}
+
+	clipText := ftpShareText(protocol, s.Cfg.RootDirectory, relPath)
+	if s.Clipboard != nil {
+		if err := s.Clipboard.WriteText(clipText); err != nil {
+			s.notifyFailure("clipboard write failed: " + err.Error())
+			return err
+		}
+	}
+	if s.Notifier != nil {
+		s.Notifier.NotifySuccess(clipText)
+	}
+	ftpSvcLog().Info("file-transfer pipeline done",
+		"protocol", protocol,
+		"remote_path", relPath,
+		"total_elapsed", time.Since(start))
+	return nil
+}
+
+// buildFTPRemotePath validates the user-controlled prefix before reusing the
+// existing dated remote-path generator shared with SSH/SCP.
+func buildFTPRemotePath(prefix string) (string, error) {
+	if err := validateFTPPathPrefix(prefix); err != nil {
+		return "", err
+	}
+	prefix = strings.TrimSpace(prefix)
+	prefix = strings.TrimPrefix(prefix, "~")
+	prefix = strings.TrimLeft(prefix, "/")
+	return buildRemoteRelPath(prefix), nil
+}
+
+func validateFTPPathPrefix(prefix string) error {
+	if strings.ContainsAny(prefix, "\x00\r\n\\") {
+		return fmt.Errorf("FTP/SFTP path contains an invalid character")
+	}
+	prefix = strings.TrimSpace(prefix)
+	prefix = strings.TrimPrefix(prefix, "~")
+	prefix = strings.TrimLeft(prefix, "/")
+	for _, segment := range strings.Split(prefix, "/") {
+		if segment == ".." {
+			return fmt.Errorf("FTP/SFTP path must stay inside the login directory")
+		}
+	}
+	return nil
+}
+
+func normalizedFTPProtocol(protocol string) string {
+	if protocol == domain.FTPProtocolSFTP {
+		return domain.FTPProtocolSFTP
+	}
+	return domain.FTPProtocolFTP
+}
+
+func ftpShareText(protocol, rootDirectory, relPath string) string {
+	rootDirectory = strings.TrimSpace(rootDirectory)
+	if rootDirectory == "" {
+		if protocol == domain.FTPProtocolSFTP {
+			rootDirectory = "~/"
+		} else {
+			rootDirectory = "/"
+		}
+	}
+	return strings.TrimRight(rootDirectory, "/") + "/" + strings.TrimLeft(relPath, "/")
+}
+
+func (s *CaptureAndFTPService) notifyFailure(reason string) {
+	if s.Notifier != nil {
+		s.Notifier.NotifyFailure(reason)
+	}
+}

internal/application/capture_ftp_test.go

@@ -0,0 +1,160 @@
+package application
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+
+	"github.com/mmmy/snapgo/internal/domain"
+)
+
+type fakeFTPUploader struct {
+	path string
+	data []byte
+	err  error
+}
+
+func (f *fakeFTPUploader) Upload(_ context.Context, remoteRelPath string, data []byte) error {
+	f.path = remoteRelPath
+	f.data = append([]byte(nil), data...)
+	return f.err
+}
+
+func TestCaptureAndFTPServiceUploadsAndCopiesFTPPath(t *testing.T) {
+	uploader := &fakeFTPUploader{}
+	clip := &fakeClipboard{}
+	notifier := &fakeNotifier{}
+	svc := &CaptureAndFTPService{
+		Uploader:  uploader,
+		Clipboard: clip,
+		Notifier:  notifier,
+		Cfg: domain.FTPConfig{
+			Protocol:   domain.FTPProtocolFTP,
+			PathPrefix: "snapgo/",
+		},
+	}
+
+	if err := svc.ExecuteWithBytes(context.Background(), []byte("png")); err != nil {
+		t.Fatalf("upload FTP screenshot: %v", err)
+	}
+	if string(uploader.data) != "png" {
+		t.Fatalf("expected PNG bytes, got %q", string(uploader.data))
+	}
+	if !strings.HasPrefix(uploader.path, "snapgo/") || !strings.HasSuffix(uploader.path, ".png") {
+		t.Fatalf("unexpected remote path %q", uploader.path)
+	}
+	if clip.text != "/"+uploader.path {
+		t.Fatalf("expected FTP root path copied, got %q", clip.text)
+	}
+	if notifier.success != clip.text {
+		t.Fatalf("expected success notification %q, got %q", clip.text, notifier.success)
+	}
+}
+
+func TestCaptureAndFTPServiceCopiesConfiguredRootPath(t *testing.T) {
+	uploader := &fakeFTPUploader{}
+	clip := &fakeClipboard{}
+	svc := &CaptureAndFTPService{
+		Uploader:  uploader,
+		Clipboard: clip,
+		Cfg: domain.FTPConfig{
+			Protocol:      domain.FTPProtocolSFTP,
+			RootDirectory: "~/ftp/",
+			PathPrefix:    "images",
+		},
+	}
+
+	if err := svc.ExecuteWithBytes(context.Background(), []byte("png")); err != nil {
+		t.Fatalf("upload SFTP screenshot: %v", err)
+	}
+	if clip.text != "~/ftp/"+uploader.path {
+		t.Fatalf("expected configured SFTP root path copied, got %q", clip.text)
+	}
+}
+
+func TestFTPShareTextJoinsConfiguredRootAndRemoteDirectory(t *testing.T) {
+	const relPath = "snapgo/2026/07/20260713-110413-18lnbx.png"
+	const want = "~/ftp/snapgo/2026/07/20260713-110413-18lnbx.png"
+	if got := ftpShareText(domain.FTPProtocolSFTP, "~/ftp/", relPath); got != want {
+		t.Fatalf("ftpShareText() = %q, want %q", got, want)
+	}
+}
+
+func TestFTPShareTextUsesProtocolDefaultWhenRootDirectoryIsEmpty(t *testing.T) {
+	const relPath = "snapgo/2026/07/image.png"
+	tests := []struct {
+		name     string
+		protocol string
+		want     string
+	}{
+		{name: "FTP", protocol: domain.FTPProtocolFTP, want: "/" + relPath},
+		{name: "SFTP", protocol: domain.FTPProtocolSFTP, want: "~/" + relPath},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := ftpShareText(tt.protocol, "", relPath); got != tt.want {
+				t.Fatalf("ftpShareText() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestCaptureAndFTPServiceRejectsTraversalBeforeUpload(t *testing.T) {
+	uploader := &fakeFTPUploader{}
+	notifier := &fakeNotifier{}
+	svc := &CaptureAndFTPService{
+		Uploader: uploader,
+		Notifier: notifier,
+		Cfg: domain.FTPConfig{
+			Protocol:   domain.FTPProtocolSFTP,
+			PathPrefix: "../../outside",
+		},
+	}
+
+	err := svc.ExecuteWithBytes(context.Background(), []byte("png"))
+	if err == nil {
+		t.Fatal("expected traversal prefix to fail")
+	}
+	if uploader.path != "" {
+		t.Fatalf("uploader should not run, got path %q", uploader.path)
+	}
+	if notifier.failure == "" {
+		t.Fatal("expected failure notification")
+	}
+}
+
+func TestCaptureAndFTPServiceSurfacesUploadFailure(t *testing.T) {
+	want := errors.New("server unavailable")
+	uploader := &fakeFTPUploader{err: want}
+	clip := &fakeClipboard{}
+	notifier := &fakeNotifier{}
+	svc := &CaptureAndFTPService{
+		Uploader:  uploader,
+		Clipboard: clip,
+		Notifier:  notifier,
+		Cfg:       domain.FTPConfig{Protocol: domain.FTPProtocolFTP},
+	}
+
+	err := svc.ExecuteWithBytes(context.Background(), []byte("png"))
+	if !errors.Is(err, want) {
+		t.Fatalf("expected %v, got %v", want, err)
+	}
+	if clip.text != "" {
+		t.Fatalf("clipboard should remain empty, got %q", clip.text)
+	}
+	if !strings.Contains(notifier.failure, "server unavailable") {
+		t.Fatalf("unexpected failure notification %q", notifier.failure)
+	}
+}
+
+func TestBuildFTPRemotePathNormalizesLoginRootMarkers(t *testing.T) {
+	remotePath, err := buildFTPRemotePath("  ~////snapgo/  ")
+	if err != nil {
+		t.Fatalf("build remote path: %v", err)
+	}
+	if strings.HasPrefix(remotePath, "/") || !strings.HasPrefix(remotePath, "snapgo/") {
+		t.Fatalf("expected relative snapgo path, got %q", remotePath)
+	}
+}

internal/application/capture_ocr.go

@@ -0,0 +1,57 @@
+package application
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/mmmy/snapgo/internal/infrastructure/clipboard"
+)
+
+// OCRRecognizer describes a provider capable of extracting text from a PNG
+// screenshot.
+type OCRRecognizer interface {
+	RecognizeText(ctx context.Context, pngBytes []byte) (string, error)
+}
+
+// CaptureOCRService wires screenshot bytes -> OCR provider -> clipboard. It
+// leaves progress reporting to the caller so native and web overlays can share
+// the same status HUD.
+type CaptureOCRService struct {
+	Recognizer OCRRecognizer
+	Clipboard  clipboard.Writer
+}
+
+// Recognize asks the configured OCR provider to extract text from the PNG.
+func (s *CaptureOCRService) Recognize(ctx context.Context, pngBytes []byte) (string, error) {
+	if s.Recognizer == nil {
+		return "", fmt.Errorf("ocr is not configured")
+	}
+	if len(pngBytes) == 0 {
+		return "", fmt.Errorf("empty screenshot")
+	}
+	text, err := s.Recognizer.RecognizeText(ctx, pngBytes)
+	if err != nil {
+		return "", err
+	}
+	text = strings.TrimSpace(text)
+	if text == "" {
+		return "", fmt.Errorf("ocr result is empty")
+	}
+	return text, nil
+}
+
+// CopyText writes the extracted text to the clipboard.
+func (s *CaptureOCRService) CopyText(_ context.Context, text string) error {
+	text = strings.TrimSpace(text)
+	if text == "" {
+		return fmt.Errorf("empty ocr text")
+	}
+	if s.Clipboard == nil {
+		return fmt.Errorf("clipboard is not configured")
+	}
+	if err := s.Clipboard.WriteText(text); err != nil {
+		return fmt.Errorf("clipboard write failed: %w", err)
+	}
+	return nil
+}

internal/application/capture_ocr_test.go

@@ -0,0 +1,50 @@
+package application
+
+import (
+	"context"
+	"testing"
+)
+
+type fakeOCRRecognizer struct {
+	image []byte
+	text  string
+}
+
+func (f *fakeOCRRecognizer) RecognizeText(_ context.Context, pngBytes []byte) (string, error) {
+	f.image = append([]byte(nil), pngBytes...)
+	if f.text == "" {
+		return "extracted text", nil
+	}
+	return f.text, nil
+}
+
+func TestCaptureOCRServiceRecognizesAndCopies(t *testing.T) {
+	ctx := context.Background()
+	recognizer := &fakeOCRRecognizer{}
+	clip := &fakeClipboard{}
+	svc := &CaptureOCRService{Recognizer: recognizer, Clipboard: clip}
+
+	text, err := svc.Recognize(ctx, []byte("png"))
+	if err != nil {
+		t.Fatalf("recognize: %v", err)
+	}
+	if string(recognizer.image) != "png" {
+		t.Fatalf("expected screenshot bytes forwarded, got %q", string(recognizer.image))
+	}
+	if text != "extracted text" {
+		t.Fatalf("expected extracted text, got %q", text)
+	}
+	if err := svc.CopyText(ctx, text); err != nil {
+		t.Fatalf("copy text: %v", err)
+	}
+	if clip.text != "extracted text" {
+		t.Fatalf("expected ocr text copied, got %q", clip.text)
+	}
+}
+
+func TestCaptureOCRServiceRejectsEmptyResult(t *testing.T) {
+	svc := &CaptureOCRService{Recognizer: &fakeOCRRecognizer{text: " \n "}}
+	if _, err := svc.Recognize(context.Background(), []byte("png")); err == nil {
+		t.Fatalf("expected empty OCR result to fail")
+	}
+}

internal/application/capture_summary.go

@@ -2,32 +2,65 @@ package application
 
 import (
 	"context"
+	"encoding/base64"
 	"fmt"
+	"net/http"
 	"time"
 
 	"github.com/mmmy/snapgo/internal/domain"
 	"github.com/mmmy/snapgo/internal/infrastructure/clipboard"
 )
 
-// VisionSummarizer describes a multimodal model capable of reading a public
-// image URL and returning a textual summary.
+// VisionSummarizer describes a multimodal model capable of reading an image
+// reference (either a public https URL or an inline base64 data URL) and
+// returning a textual summary.
 type VisionSummarizer interface {
 	SummarizeImage(ctx context.Context, prompt string, imageURL string) (string, error)
 }
 
-// CaptureSummaryService wires screenshot bytes -> S3 public URL -> LLM
-// summary -> clipboard. It intentionally does not notify UI state itself:
-// the caller emits fine-grained "uploading / recognizing / done" progress.
+// ObjectDeleter is an optional capability an OSSProvider may implement so the
+// summary pipeline can delete the temporary screenshot it uploaded purely so a
+// remote model could fetch it. It is kept separate from domain.OSSProvider to
+// avoid forcing every provider (or test fake) to implement deletion.
+type ObjectDeleter interface {
+	Delete(ctx context.Context, key string) error
+}
+
+// CaptureSummaryService wires screenshot bytes -> multimodal LLM summary ->
+// clipboard. It prefers sending the image inline as a base64 data URL and only
+// falls back to an S3 upload (public URL) when the payload exceeds the
+// provider's inline size limit. It intentionally does not notify UI state
+// itself: the caller emits fine-grained "uploading / recognizing / done"
+// progress.
 type CaptureSummaryService struct {
 	Provider   domain.OSSProvider
 	Summarizer VisionSummarizer
 	Clipboard  clipboard.Writer
 	Prompt     string
 	PathPrefix string
+	// MaxInlineBytes caps the PNG size eligible for inline base64. Payloads
+	// larger than this must go through S3. A value <= 0 disables the inline
+	// path entirely (always upload).
+	MaxInlineBytes int
+	// HTTPClient is used for the public-URL reachability probe. Defaults to a
+	// short-timeout client when nil.
+	HTTPClient *http.Client
+}
+
+// CanInline reports whether the screenshot is small enough to be embedded
+// directly in the request as a base64 data URL.
+func (s *CaptureSummaryService) CanInline(pngBytes []byte) bool {
+	return s.MaxInlineBytes > 0 && len(pngBytes) <= s.MaxInlineBytes
+}
+
+// InlineDataURL encodes the PNG as an RFC 2397 data URL suitable for the
+// image_url field of an OpenAI-compatible request.
+func (s *CaptureSummaryService) InlineDataURL(pngBytes []byte) string {
+	return "data:image/png;base64," + base64.StdEncoding.EncodeToString(pngBytes)
 }
 
 // UploadImage uploads the screenshot and returns the public URL visible to
-// the multimodal provider.
+// the multimodal provider. Used only when the image is too large to inline.
 func (s *CaptureSummaryService) UploadImage(ctx context.Context, pngBytes []byte) (*domain.UploadResult, error) {
 	if s.Provider == nil {
 		return nil, fmt.Errorf("s3 is not configured")
@@ -49,7 +82,60 @@ func (s *CaptureSummaryService) UploadImage(ctx context.Context, pngBytes []byte
 	}, nil
 }
 
-// Summarize asks the configured model to summarize the uploaded image URL.
+// EnsureReachable verifies the public URL can actually be fetched, so we can
+// surface a clear "link not reachable" message instead of an opaque provider
+// error when the bucket is private or fronted by an inaccessible CDN.
+func (s *CaptureSummaryService) EnsureReachable(ctx context.Context, imageURL string) error {
+	client := s.HTTPClient
+	if client == nil {
+		client = &http.Client{Timeout: 10 * time.Second}
+	}
+	probe := func(method string) (int, error) {
+		req, err := http.NewRequestWithContext(ctx, method, imageURL, nil)
+		if err != nil {
+			return 0, err
+		}
+		resp, err := client.Do(req)
+		if err != nil {
+			return 0, err
+		}
+		resp.Body.Close()
+		return resp.StatusCode, nil
+	}
+	status, err := probe(http.MethodHead)
+	// Some S3-compatible endpoints reject HEAD; retry with GET before failing.
+	if err != nil || status == http.StatusMethodNotAllowed || status == http.StatusForbidden {
+		if s, gerr := probe(http.MethodGet); gerr == nil {
+			status, err = s, nil
+		} else if err == nil {
+			err = gerr
+		}
+	}
+	if err != nil {
+		return fmt.Errorf("图片链接不可达（模型无法读取上传的截图）：%w", err)
+	}
+	if status < 200 || status >= 300 {
+		return fmt.Errorf("图片链接不可达：HTTP %d，请确认对象存储 bucket 公网可读或已正确配置 PublicURLBase", status)
+	}
+	return nil
+}
+
+// DeleteUploaded removes the temporary object from S3 if the provider supports
+// deletion. It is best-effort: a nil return means either success or that the
+// provider cannot delete.
+func (s *CaptureSummaryService) DeleteUploaded(ctx context.Context, key string) error {
+	if key == "" {
+		return nil
+	}
+	deleter, ok := s.Provider.(ObjectDeleter)
+	if !ok {
+		return nil
+	}
+	return deleter.Delete(ctx, key)
+}
+
+// Summarize asks the configured model to summarize the image reference, which
+// may be a public URL or an inline base64 data URL.
 func (s *CaptureSummaryService) Summarize(ctx context.Context, imageURL string) (string, error) {
 	if s.Summarizer == nil {
 		return "", fmt.Errorf("llm is not configured")

internal/application/capture_summary_test.go

@@ -2,6 +2,7 @@ package application
 
 import (
 	"context"
+	"strings"
 	"testing"
 )
 
@@ -10,6 +11,7 @@ type fakeOSSProvider struct {
 	data        []byte
 	contentType string
 	url         string
+	deletedKey  string
 }
 
 func (f *fakeOSSProvider) Upload(_ context.Context, key string, data []byte, contentType string) (string, error) {
@@ -24,6 +26,11 @@ func (f *fakeOSSProvider) Upload(_ context.Context, key string, data []byte, con
 
 func (f *fakeOSSProvider) Name() string { return "fake" }
 
+func (f *fakeOSSProvider) Delete(_ context.Context, key string) error {
+	f.deletedKey = key
+	return nil
+}
+
 type fakeSummarizer struct {
 	prompt string
 	url    string
@@ -84,3 +91,50 @@ func TestCaptureSummaryServiceUploadsSummarizesAndCopies(t *testing.T) {
 		t.Fatalf("expected summary copied, got %q", clip.text)
 	}
 }
+
+func TestCaptureSummaryServiceInlineDataURL(t *testing.T) {
+	svc := &CaptureSummaryService{MaxInlineBytes: 10}
+
+	if !svc.CanInline([]byte("small")) {
+		t.Fatalf("expected 5-byte payload to be inlinable under 10-byte cap")
+	}
+	if svc.CanInline([]byte("this is definitely too big")) {
+		t.Fatalf("expected oversized payload to be rejected for inlining")
+	}
+
+	url := svc.InlineDataURL([]byte("png"))
+	if !strings.HasPrefix(url, "data:image/png;base64,") {
+		t.Fatalf("expected base64 data URL prefix, got %q", url)
+	}
+	if strings.Contains(url, "https://") {
+		t.Fatalf("inline URL must not be a remote URL, got %q", url)
+	}
+}
+
+func TestCaptureSummaryServiceDeleteUploadedUsesDeleter(t *testing.T) {
+	provider := &fakeOSSProvider{}
+	svc := &CaptureSummaryService{Provider: provider}
+
+	if err := svc.DeleteUploaded(context.Background(), "snapgo/a.png"); err != nil {
+		t.Fatalf("delete uploaded: %v", err)
+	}
+	if provider.deletedKey != "snapgo/a.png" {
+		t.Fatalf("expected object deleted, got %q", provider.deletedKey)
+	}
+}
+
+func TestCaptureSummaryServiceDeleteUploadedNoDeleterIsNoop(t *testing.T) {
+	// A provider without Delete must not error when cleanup is requested.
+	svc := &CaptureSummaryService{Provider: nonDeletingProvider{}}
+	if err := svc.DeleteUploaded(context.Background(), "snapgo/a.png"); err != nil {
+		t.Fatalf("expected no-op delete, got %v", err)
+	}
+}
+
+type nonDeletingProvider struct{}
+
+func (nonDeletingProvider) Upload(_ context.Context, _ string, _ []byte, _ string) (string, error) {
+	return "https://cdn.example.com/x.png", nil
+}
+
+func (nonDeletingProvider) Name() string { return "no-delete" }

internal/domain/config.go

@@ -1,8 +1,8 @@
 // Package domain — configuration types.
 //
-// S3Config and SSHConfig are intentionally split into their own structs so
-// that future providers can introduce their own configuration types side-
-// by-side without polluting the core domain types file.
+// S3Config, SSHConfig, and FTPConfig are intentionally split into their own
+// structs so future providers can introduce configuration types side-by-side
+// without polluting the core domain types file.
 package domain
 
 // S3Config describes the connection parameters for any S3-compatible
@@ -72,6 +72,37 @@ type SSHConfig struct {
 	ConnectTimeoutSecs int    `json:"connectTimeoutSecs"`
 }
 
+// FTPConfig describes a file-transfer destination reached through FTP or
+// SFTP. It is intentionally separate from SSHConfig: SFTP uses the SSH
+// transport, but it is a different file-transfer protocol from the existing
+// SCP action and has its own remote-root semantics.
+//
+// Field design notes:
+//   - Protocol is either "ftp" or "sftp". Their default ports are 21 and 22.
+//   - AuthMethod is used only by SFTP. "password" uses Password, while "key"
+//     reuses the local ssh-agent and ~/.ssh/id_* discovery used by SSH/SCP.
+//   - PathPrefix is relative to the account's login root. The application
+//     rejects absolute paths and traversal segments before uploading.
+//   - RootDirectory is only used to build the path copied to the clipboard.
+//     Keeping it separate from PathPrefix lets the server expose a login root
+//     such as "~/ftp/" while uploads still target a relative directory such
+//     as "snapgo/".
+//   - StrictHostKey and KnownHostsPath apply only to SFTP. Plain FTP has no
+//     host-key mechanism and sends credentials and data without encryption.
+type FTPConfig struct {
+	Protocol           string `json:"protocol"`
+	Host               string `json:"host"`
+	Port               int    `json:"port"`
+	User               string `json:"user"`
+	AuthMethod         string `json:"authMethod"`
+	Password           string `json:"password"`
+	RootDirectory      string `json:"rootDirectory"`
+	PathPrefix         string `json:"pathPrefix"`
+	StrictHostKey      bool   `json:"strictHostKey"`
+	KnownHostsPath     string `json:"knownHostsPath"`
+	ConnectTimeoutSecs int    `json:"connectTimeoutSecs"`
+}
+
 // LLMProviderConfig stores one OpenAI-compatible multimodal chat endpoint.
 //
 // The three built-in providers (Qwen, Doubao/Ark, OpenAI-compatible) all use
@@ -86,8 +117,20 @@ type LLMProviderConfig struct {
 	MaxTokens   int     `json:"maxTokens"`
 	Temperature float64 `json:"temperature"`
 	TimeoutSecs int     `json:"timeoutSecs"`
+	// MaxInlineBytes caps the screenshot size (in bytes of the PNG payload)
+	// that may be sent inline as a base64 data URL. Above this threshold the
+	// summary pipeline falls back to uploading the image to S3 and passing a
+	// public URL instead, because most providers reject oversized inline
+	// images. A value <= 0 means "use the built-in default".
+	MaxInlineBytes int `json:"maxInlineBytes"`
 }
 
+// DefaultMaxInlineBytes is the fallback inline-image cap (~4 MiB) used when a
+// provider config does not specify MaxInlineBytes. It is a conservative bound
+// that keeps a single base64 data URL within the request-size limits accepted
+// by the common OpenAI-compatible multimodal endpoints.
+const DefaultMaxInlineBytes = 4 << 20
+
 // LLMConfig controls screenshot summarisation.
 type LLMConfig struct {
 	ActiveProvider string                       `json:"activeProvider"`
@@ -95,6 +138,29 @@ type LLMConfig struct {
 	Providers      map[string]LLMProviderConfig `json:"providers"`
 }
 
+// OCRProviderConfig stores one cloud OCR endpoint that accepts a screenshot
+// image and returns extracted text. Aliyun and Volcengine both authenticate
+// with an AccessKey pair, but their signing schemes use slightly different
+// endpoint metadata; keeping Region/Service/Action/Version configurable lets
+// the presets track official API changes without a schema rewrite.
+type OCRProviderConfig struct {
+	Label           string `json:"label"`
+	Endpoint        string `json:"endpoint"`
+	AccessKeyID     string `json:"accessKeyId"`
+	AccessKeySecret string `json:"accessKeySecret"`
+	Region          string `json:"region"`
+	Service         string `json:"service"`
+	Action          string `json:"action"`
+	Version         string `json:"version"`
+	TimeoutSecs     int    `json:"timeoutSecs"`
+}
+
+// OCRConfig controls screenshot text extraction.
+type OCRConfig struct {
+	ActiveProvider string                       `json:"activeProvider"`
+	Providers      map[string]OCRProviderConfig `json:"providers"`
+}
+
 // SSH authentication method identifiers stored in SSHConfig.AuthMethod.
 const (
 	// SSHAuthBuiltin is the legacy combined method (password → agent → key
@@ -110,6 +176,12 @@ const (
 	SSHAuthKerberos = "kerberos"
 )
 
+// File-transfer protocol identifiers stored in FTPConfig.Protocol.
+const (
+	FTPProtocolFTP  = "ftp"
+	FTPProtocolSFTP = "sftp"
+)
+
 // Built-in LLM provider identifiers.
 const (
 	LLMProviderQwen   = "qwen"
@@ -117,6 +189,12 @@ const (
 	LLMProviderOpenAI = "openai"
 )
 
+// Built-in OCR provider identifiers.
+const (
+	OCRProviderAliyun     = "aliyun"
+	OCRProviderVolcengine = "volcengine"
+)
+
 // Theme preference identifiers stored in AppConfig.Theme.
 const (
 	ThemeAuto  = "auto"
@@ -140,8 +218,8 @@ func (c SSHConfig) IsKerberos() bool {
 
 // AppConfig is the top-level on-disk configuration document.
 //
-// We keep S3 / SSH nested so that adding more providers later (e.g. AliyunOSS,
-// COS, FTP) only requires a new sibling field rather than a schema rewrite.
+// We keep S3 / SSH / FTP nested so adding another provider later only requires
+// a new sibling field rather than a schema rewrite.
 type AppConfig struct {
 	// Hotkey describes the global shortcut that triggers a capture.
 	// Stored as a human-readable string like "cmd+shift+a"; parsing happens
@@ -158,8 +236,14 @@ type AppConfig struct {
 	// destination triggered by the save-remote toolbar button.
 	SSH SSHConfig `json:"ssh"`
 
+	// FTP holds the destination used by the dedicated FTP/SFTP toolbar action.
+	FTP FTPConfig `json:"ftp"`
+
 	// LLM holds provider settings for the "copy summary" screenshot action.
 	LLM LLMConfig `json:"llm"`
+
+	// OCR holds provider settings for the "extract text" screenshot action.
+	OCR OCRConfig `json:"ocr"`
 }
 
 // DefaultAppConfig returns sane zero-value defaults used on first launch.
@@ -177,7 +261,17 @@ func DefaultAppConfig() AppConfig {
 			ConnectTimeoutSecs: 10,
 			StrictHostKey:      false,
 		},
+		FTP: FTPConfig{
+			Protocol:           FTPProtocolFTP,
+			Port:               21,
+			AuthMethod:         SSHAuthPassword,
+			RootDirectory:      "/",
+			PathPrefix:         "snapgo/",
+			ConnectTimeoutSecs: 10,
+			StrictHostKey:      false,
+		},
 		LLM: DefaultLLMConfig(),
+		OCR: DefaultOCRConfig(),
 	}
 	cfg.Normalize()
 	return cfg
@@ -198,6 +292,7 @@ func DefaultLLMConfig() LLMConfig {
 				MaxTokens:      600,
 				Temperature:    0.2,
 				TimeoutSecs:    60,
+				MaxInlineBytes: DefaultMaxInlineBytes,
 			},
 			LLMProviderDoubao: {
 				Label:          "火山方舟豆包多模态",
@@ -206,6 +301,7 @@ func DefaultLLMConfig() LLMConfig {
 				MaxTokens:      600,
 				Temperature:    0.2,
 				TimeoutSecs:    60,
+				MaxInlineBytes: DefaultMaxInlineBytes,
 			},
 			LLMProviderOpenAI: {
 				Label:          "ChatGPT / OpenAI-compatible",
@@ -214,6 +310,34 @@ func DefaultLLMConfig() LLMConfig {
 				MaxTokens:      600,
 				Temperature:    0.2,
 				TimeoutSecs:    60,
+				MaxInlineBytes: DefaultMaxInlineBytes,
+			},
+		},
+	}
+}
+
+// DefaultOCRConfig returns the built-in OCR provider presets. Users only need
+// to fill AccessKey credentials for the common regions/actions, while advanced
+// accounts can still override endpoint metadata from the settings UI.
+func DefaultOCRConfig() OCRConfig {
+	return OCRConfig{
+		ActiveProvider: OCRProviderAliyun,
+		Providers: map[string]OCRProviderConfig{
+			OCRProviderAliyun: {
+				Label:       "阿里云文字识别",
+				Endpoint:    "https://ocr-api.cn-hangzhou.aliyuncs.com",
+				Action:      "RecognizeGeneral",
+				Version:     "2021-07-07",
+				TimeoutSecs: 30,
+			},
+			OCRProviderVolcengine: {
+				Label:       "火山引擎文字识别",
+				Endpoint:    "https://visual.volcengineapi.com",
+				Region:      "cn-north-1",
+				Service:     "cv",
+				Action:      "OCRNormal",
+				Version:     "2020-08-26",
+				TimeoutSecs: 30,
 			},
 		},
 	}
@@ -240,6 +364,32 @@ func (c *AppConfig) Normalize() {
 	if c.SSH.ConnectTimeoutSecs == 0 {
 		c.SSH.ConnectTimeoutSecs = 10
 	}
+	if c.FTP.Protocol != FTPProtocolFTP && c.FTP.Protocol != FTPProtocolSFTP {
+		c.FTP.Protocol = FTPProtocolFTP
+	}
+	if c.FTP.Port == 0 {
+		if c.FTP.Protocol == FTPProtocolSFTP {
+			c.FTP.Port = 22
+		} else {
+			c.FTP.Port = 21
+		}
+	}
+	if c.FTP.AuthMethod != SSHAuthPassword && c.FTP.AuthMethod != SSHAuthKey {
+		c.FTP.AuthMethod = SSHAuthPassword
+	}
+	if c.FTP.RootDirectory == "" {
+		if c.FTP.Protocol == FTPProtocolSFTP {
+			c.FTP.RootDirectory = "~/"
+		} else {
+			c.FTP.RootDirectory = "/"
+		}
+	}
+	if c.FTP.PathPrefix == "" {
+		c.FTP.PathPrefix = "snapgo/"
+	}
+	if c.FTP.ConnectTimeoutSecs == 0 {
+		c.FTP.ConnectTimeoutSecs = 10
+	}
 
 	defaultLLM := DefaultLLMConfig()
 	if c.LLM.ActiveProvider == "" {
@@ -275,8 +425,48 @@ func (c *AppConfig) Normalize() {
 		if current.TimeoutSecs == 0 {
 			current.TimeoutSecs = def.TimeoutSecs
 		}
+		if current.MaxInlineBytes <= 0 {
+			current.MaxInlineBytes = DefaultMaxInlineBytes
+		}
 		c.LLM.Providers[id] = current
 	}
+
+	defaultOCR := DefaultOCRConfig()
+	if c.OCR.ActiveProvider == "" {
+		c.OCR.ActiveProvider = defaultOCR.ActiveProvider
+	}
+	if c.OCR.Providers == nil {
+		c.OCR.Providers = map[string]OCRProviderConfig{}
+	}
+	for id, def := range defaultOCR.Providers {
+		current, ok := c.OCR.Providers[id]
+		if !ok {
+			c.OCR.Providers[id] = def
+			continue
+		}
+		if current.Label == "" {
+			current.Label = def.Label
+		}
+		if current.Endpoint == "" {
+			current.Endpoint = def.Endpoint
+		}
+		if current.Region == "" {
+			current.Region = def.Region
+		}
+		if current.Service == "" {
+			current.Service = def.Service
+		}
+		if current.Action == "" {
+			current.Action = def.Action
+		}
+		if current.Version == "" {
+			current.Version = def.Version
+		}
+		if current.TimeoutSecs == 0 {
+			current.TimeoutSecs = def.TimeoutSecs
+		}
+		c.OCR.Providers[id] = current
+	}
 }
 
 // IsS3Configured reports whether the user has filled the mandatory S3 fields.
@@ -294,6 +484,14 @@ func (c AppConfig) IsSSHConfigured() bool {
 	return c.SSH.Host != "" && c.SSH.User != ""
 }
 
+// IsFTPConfigured reports whether the FTP/SFTP destination has the minimum
+// fields required to attempt a connection. Password is not required because
+// SFTP key authentication and password-less FTP accounts are both valid.
+func (c AppConfig) IsFTPConfigured() bool {
+	return (c.FTP.Protocol == FTPProtocolFTP || c.FTP.Protocol == FTPProtocolSFTP) &&
+		c.FTP.Host != "" && c.FTP.User != ""
+}
+
 // ActiveLLMProvider returns the selected provider config plus a boolean
 // indicating whether the selection exists.
 func (c AppConfig) ActiveLLMProvider() (string, LLMProviderConfig, bool) {
@@ -311,3 +509,32 @@ func (c AppConfig) IsLLMConfigured() bool {
 	_, provider, ok := c.ActiveLLMProvider()
 	return ok && provider.BaseURL != "" && provider.APIKey != "" && provider.Model != ""
 }
+
+// ActiveOCRProvider returns the selected OCR provider config plus a boolean
+// indicating whether the selection exists.
+func (c AppConfig) ActiveOCRProvider() (string, OCRProviderConfig, bool) {
+	id := c.OCR.ActiveProvider
+	if id == "" {
+		id = OCRProviderAliyun
+	}
+	provider, ok := c.OCR.Providers[id]
+	return id, provider, ok
+}
+
+// IsOCRConfigured reports whether the selected OCR provider has the fields
+// required to sign and send a request.
+func (c AppConfig) IsOCRConfigured() bool {
+	id, provider, ok := c.ActiveOCRProvider()
+	if !ok ||
+		provider.Endpoint == "" ||
+		provider.AccessKeyID == "" ||
+		provider.AccessKeySecret == "" ||
+		provider.Action == "" ||
+		provider.Version == "" {
+		return false
+	}
+	if id == OCRProviderVolcengine && (provider.Region == "" || provider.Service == "") {
+		return false
+	}
+	return true
+}

internal/domain/config_ftp_test.go

@@ -0,0 +1,56 @@
+package domain
+
+import "testing"
+
+func TestDefaultAppConfigIncludesFTPDefaults(t *testing.T) {
+	cfg := DefaultAppConfig()
+	if cfg.FTP.Protocol != FTPProtocolFTP {
+		t.Fatalf("expected default FTP protocol, got %q", cfg.FTP.Protocol)
+	}
+	if cfg.FTP.Port != 21 {
+		t.Fatalf("expected default FTP port 21, got %d", cfg.FTP.Port)
+	}
+	if cfg.FTP.PathPrefix != "snapgo/" {
+		t.Fatalf("expected default path prefix, got %q", cfg.FTP.PathPrefix)
+	}
+	if cfg.FTP.RootDirectory != "/" {
+		t.Fatalf("expected default root directory, got %q", cfg.FTP.RootDirectory)
+	}
+	if cfg.FTP.ConnectTimeoutSecs != 10 {
+		t.Fatalf("expected 10 second timeout, got %d", cfg.FTP.ConnectTimeoutSecs)
+	}
+}
+
+func TestNormalizeUsesSFTPDefaultPort(t *testing.T) {
+	cfg := AppConfig{
+		FTP: FTPConfig{
+			Protocol: FTPProtocolSFTP,
+		},
+	}
+	cfg.Normalize()
+	if cfg.FTP.Port != 22 {
+		t.Fatalf("expected SFTP port 22, got %d", cfg.FTP.Port)
+	}
+	if cfg.FTP.AuthMethod != SSHAuthPassword {
+		t.Fatalf("expected password auth default, got %q", cfg.FTP.AuthMethod)
+	}
+	if cfg.FTP.RootDirectory != "~/" {
+		t.Fatalf("expected SFTP home root directory, got %q", cfg.FTP.RootDirectory)
+	}
+}
+
+func TestIsFTPConfiguredRequiresProtocolHostAndUser(t *testing.T) {
+	cfg := DefaultAppConfig()
+	if cfg.IsFTPConfigured() {
+		t.Fatal("empty FTP destination should not be configured")
+	}
+	cfg.FTP.Host = "files.example.com"
+	cfg.FTP.User = "snapgo"
+	if !cfg.IsFTPConfigured() {
+		t.Fatal("host and user should be enough for a normalized FTP config")
+	}
+	cfg.FTP.Protocol = "invalid"
+	if cfg.IsFTPConfigured() {
+		t.Fatal("invalid protocol should not be configured")
+	}
+}

internal/infrastructure/ftp/uploader.go

@@ -0,0 +1,288 @@
+// Package ftp provides the FTP side of SnapGo's FTP/SFTP destination.
+//
+// Design rationale:
+//   - Plain FTP needs a real protocol client for PASV/EPSV handling; hand-
+//     rolling those details would be fragile across common servers.
+//   - SFTP is delegated to the sibling SSH adapter so authentication, agent,
+//     key discovery, and known_hosts behaviour stay consistent with SCP.
+//   - Both implementations upload to a temporary name and rename only after
+//     the payload is complete, preventing a failed transfer from exposing a
+//     partially written screenshot at the final path.
+package ftp
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"log/slog"
+	"net"
+	"path"
+	"strings"
+	"sync"
+	"time"
+
+	ftpclient "github.com/jlaffaye/ftp"
+
+	"github.com/mmmy/snapgo/internal/domain"
+	sshpkg "github.com/mmmy/snapgo/internal/infrastructure/ssh"
+)
+
+// RemoteUploader is the common capability exposed to app.go for FTP and
+// SFTP. The application service only needs Upload; TestConnection remains an
+// infrastructure concern used by the Settings probe RPC.
+type RemoteUploader interface {
+	Upload(ctx context.Context, remoteRelPath string, data []byte) error
+	TestConnection(ctx context.Context) error
+}
+
+// NewUploader validates cfg and returns the adapter for its selected protocol.
+func NewUploader(cfg domain.FTPConfig) (RemoteUploader, error) {
+	normalized, err := normalizeConfig(cfg)
+	if err != nil {
+		return nil, err
+	}
+	if normalized.Protocol == domain.FTPProtocolSFTP {
+		return sshpkg.NewSFTPUploader(normalized), nil
+	}
+	return &plainUploader{cfg: normalized}, nil
+}
+
+type plainUploader struct {
+	cfg domain.FTPConfig
+}
+
+func ftpLog() *slog.Logger { return slog.Default().With("component", "ftp") }
+
+func normalizeConfig(cfg domain.FTPConfig) (domain.FTPConfig, error) {
+	cfg.Protocol = strings.ToLower(strings.TrimSpace(cfg.Protocol))
+	if cfg.Protocol == "" {
+		cfg.Protocol = domain.FTPProtocolFTP
+	}
+	if cfg.Protocol != domain.FTPProtocolFTP && cfg.Protocol != domain.FTPProtocolSFTP {
+		return domain.FTPConfig{}, fmt.Errorf("file transfer: protocol must be ftp or sftp")
+	}
+	cfg.Host = strings.TrimSpace(cfg.Host)
+	cfg.User = strings.TrimSpace(cfg.User)
+	if cfg.Host == "" || cfg.User == "" {
+		return domain.FTPConfig{}, fmt.Errorf("file transfer: host and user are required")
+	}
+	if cfg.Port <= 0 {
+		if cfg.Protocol == domain.FTPProtocolSFTP {
+			cfg.Port = 22
+		} else {
+			cfg.Port = 21
+		}
+	}
+	if cfg.Port > 65535 {
+		return domain.FTPConfig{}, fmt.Errorf("file transfer: port must be between 1 and 65535")
+	}
+	if cfg.ConnectTimeoutSecs <= 0 {
+		cfg.ConnectTimeoutSecs = 10
+	}
+	if cfg.AuthMethod == "" {
+		cfg.AuthMethod = domain.SSHAuthPassword
+	}
+	if cfg.Protocol == domain.FTPProtocolSFTP &&
+		cfg.AuthMethod != domain.SSHAuthPassword && cfg.AuthMethod != domain.SSHAuthKey {
+		return domain.FTPConfig{}, fmt.Errorf("sftp: auth method must be password or key")
+	}
+	return cfg, nil
+}
+
+func (u *plainUploader) dial(ctx context.Context) (*ftpclient.ServerConn, error) {
+	timeout := time.Duration(u.cfg.ConnectTimeoutSecs) * time.Second
+	addr := net.JoinHostPort(u.cfg.Host, fmt.Sprintf("%d", u.cfg.Port))
+	ftpLog().Info("FTP dial start",
+		"addr", addr,
+		"user", u.cfg.User,
+		"timeout", timeout,
+		"has_password", u.cfg.Password != "")
+	conn, err := ftpclient.Dial(
+		addr,
+		ftpclient.DialWithDialFunc(contextDialFunc(ctx, timeout)),
+		ftpclient.DialWithShutTimeout(timeout),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("ftp: dial %s: %w", addr, err)
+	}
+	if err := conn.Login(u.cfg.User, u.cfg.Password); err != nil {
+		_ = conn.Quit()
+		return nil, fmt.Errorf("ftp: login: %w", err)
+	}
+	return conn, nil
+}
+
+// Upload stores one screenshot through plain FTP.
+func (u *plainUploader) Upload(ctx context.Context, remoteRelPath string, data []byte) error {
+	cleaned, err := validateRemoteRelativePath(remoteRelPath)
+	if err != nil {
+		return err
+	}
+	conn, err := u.dial(ctx)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = conn.Quit() }()
+
+	if err := enterFTPDirectory(conn, path.Dir(cleaned)); err != nil {
+		return err
+	}
+	base := path.Base(cleaned)
+
+	tempName := temporaryRemoteName(base)
+	removeTemp := true
+	defer func() {
+		if removeTemp {
+			_ = conn.Delete(tempName)
+		}
+	}()
+
+	if err := conn.Stor(tempName, &contextReader{ctx: ctx, reader: bytes.NewReader(data)}); err != nil {
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+		return fmt.Errorf("ftp: store %s: %w", cleaned, err)
+	}
+	if err := conn.Rename(tempName, base); err != nil {
+		return fmt.Errorf("ftp: commit %s: %w", cleaned, err)
+	}
+	removeTemp = false
+	ftpLog().Info("FTP upload ok", "remote_path", cleaned, "size", len(data))
+	return nil
+}
+
+// TestConnection writes and removes a small probe under the configured path,
+// proving that credentials and directory permissions are both usable.
+func (u *plainUploader) TestConnection(ctx context.Context) error {
+	probe, err := probeRemotePath(u.cfg.PathPrefix)
+	if err != nil {
+		return err
+	}
+	conn, err := u.dial(ctx)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = conn.Quit() }()
+
+	if err := enterFTPDirectory(conn, path.Dir(probe)); err != nil {
+		return err
+	}
+	base := path.Base(probe)
+	if err := conn.Stor(base, strings.NewReader("snapgo")); err != nil {
+		return fmt.Errorf("ftp probe: write: %w", err)
+	}
+	if err := conn.Delete(base); err != nil {
+		return fmt.Errorf("ftp probe: delete: %w", err)
+	}
+	return nil
+}
+
+// enterFTPDirectory walks to dir relative to the login root, creating missing
+// segments.
+func enterFTPDirectory(conn *ftpclient.ServerConn, dir string) error {
+	dir = strings.Trim(dir, "/")
+	if dir == "" || dir == "." {
+		return nil
+	}
+	for _, segment := range strings.Split(dir, "/") {
+		if err := conn.ChangeDir(segment); err == nil {
+			continue
+		}
+		if err := conn.MakeDir(segment); err != nil {
+			// A concurrent uploader may have created the directory after our
+			// failed CWD. Retrying CWD distinguishes that race from a real error.
+			if retryErr := conn.ChangeDir(segment); retryErr == nil {
+				continue
+			}
+			return fmt.Errorf("ftp: create directory %q: %w", segment, err)
+		}
+		if err := conn.ChangeDir(segment); err != nil {
+			return fmt.Errorf("ftp: enter directory %q: %w", segment, err)
+		}
+	}
+	return nil
+}
+
+func validateRemoteRelativePath(value string) (string, error) {
+	value = strings.TrimSpace(value)
+	if value == "" || strings.HasPrefix(value, "/") || strings.HasPrefix(value, "~") {
+		return "", fmt.Errorf("file transfer: remote path must be relative to the login directory")
+	}
+	if strings.ContainsAny(value, "\x00\r\n\\") {
+		return "", fmt.Errorf("file transfer: remote path contains an invalid character")
+	}
+	for _, segment := range strings.Split(value, "/") {
+		if segment == ".." {
+			return "", fmt.Errorf("file transfer: remote path must not contain '..'")
+		}
+	}
+	cleaned := path.Clean(value)
+	if cleaned == "." || path.Base(cleaned) == "." || path.Base(cleaned) == ".." {
+		return "", fmt.Errorf("file transfer: remote filename is empty")
+	}
+	return cleaned, nil
+}
+
+func probeRemotePath(prefix string) (string, error) {
+	prefix = strings.TrimSpace(prefix)
+	prefix = strings.TrimPrefix(prefix, "~")
+	prefix = strings.TrimLeft(prefix, "/")
+	probe := fmt.Sprintf(".snapgo-probe-%d", time.Now().UnixNano())
+	return validateRemoteRelativePath(path.Join(prefix, probe))
+}
+
+func temporaryRemoteName(base string) string {
+	return fmt.Sprintf(".%s.snapgo-upload-%d", base, time.Now().UnixNano())
+}
+
+type contextReader struct {
+	ctx    context.Context
+	reader io.Reader
+}
+
+func contextDialFunc(ctx context.Context, timeout time.Duration) func(string, string) (net.Conn, error) {
+	dialer := &net.Dialer{Timeout: timeout}
+	return func(network, address string) (net.Conn, error) {
+		conn, err := dialer.DialContext(ctx, network, address)
+		if err != nil {
+			return nil, err
+		}
+		wrapped := &cancelableConn{
+			Conn: conn,
+			done: make(chan struct{}),
+		}
+		go func() {
+			select {
+			case <-ctx.Done():
+				_ = wrapped.Close()
+			case <-wrapped.done:
+			}
+		}()
+		return wrapped, nil
+	}
+}
+
+type cancelableConn struct {
+	net.Conn
+	done chan struct{}
+	once sync.Once
+}
+
+func (c *cancelableConn) Close() error {
+	var err error
+	c.once.Do(func() {
+		close(c.done)
+		err = c.Conn.Close()
+	})
+	return err
+}
+
+func (r *contextReader) Read(p []byte) (int, error) {
+	select {
+	case <-r.ctx.Done():
+		return 0, r.ctx.Err()
+	default:
+		return r.reader.Read(p)
+	}
+}

internal/infrastructure/ftp/uploader_test.go

@@ -0,0 +1,34 @@
+package ftp
+
+import "testing"
+
+func TestValidateRemoteRelativePath(t *testing.T) {
+	valid, err := validateRemoteRelativePath("snapgo/2026/07/image.png")
+	if err != nil {
+		t.Fatalf("valid path rejected: %v", err)
+	}
+	if valid != "snapgo/2026/07/image.png" {
+		t.Fatalf("unexpected normalized path %q", valid)
+	}
+
+	invalid := []string{
+		"",
+		"/absolute/image.png",
+		"~/image.png",
+		"../image.png",
+		"snapgo/../../image.png",
+		"snapgo\\image.png",
+		"snapgo/image.png\nnext",
+	}
+	for _, value := range invalid {
+		if _, err := validateRemoteRelativePath(value); err == nil {
+			t.Errorf("expected %q to be rejected", value)
+		}
+	}
+}
+
+func TestProbeRemotePathRejectsTraversalPrefix(t *testing.T) {
+	if _, err := probeRemotePath("../../outside"); err == nil {
+		t.Fatal("expected traversal prefix to fail")
+	}
+}

internal/infrastructure/hotkey/hotkey.go

@@ -104,7 +104,7 @@ func parseSpec(spec string) ([]hk.Modifier, hk.Key, error) {
 		case "option", "alt":
 			mods = append(mods, modOption())
 		case "shift":
-			mods = append(mods, hk.ModShift)
+			mods = append(mods, modShift())
 		default:
 			k, ok := lookupKey(p)
 			if !ok {

internal/infrastructure/hotkey/hotkey_darwin.go

@@ -1,10 +1,15 @@
-//go:build darwin
+//go:build darwin && cgo
 
 package hotkey
 
 import hk "golang.design/x/hotkey"
 
 // macOS uses ⌘ as the primary modifier; Option corresponds to Alt.
+//
+// This file is gated on cgo because golang.design/x/hotkey only exposes the
+// Mod* constants from its cgo-backed darwin implementation; with CGO_ENABLED=0
+// the package falls back to a stub that defines no constants.
 func modCmd() hk.Modifier    { return hk.ModCmd }
 func modCtrl() hk.Modifier   { return hk.ModCtrl }
 func modOption() hk.Modifier { return hk.ModOption }
+func modShift() hk.Modifier  { return hk.ModShift }

internal/infrastructure/hotkey/hotkey_linux.go

@@ -0,0 +1,18 @@
+//go:build linux && cgo
+
+package hotkey
+
+import hk "golang.design/x/hotkey"
+
+// On Linux we map "cmd" to Ctrl so the same config string ("cmd+shift+a")
+// stays meaningful across platforms.
+//
+// The X11 backend exposes modifiers as Mod1..Mod5 rather than named Alt/Option
+// constants; Mod1 is the conventional Alt mask under X11, so "option"/"alt"
+// resolve to hk.Mod1. This file is gated on cgo because the constants only
+// exist in the cgo-backed linux implementation (CGO_ENABLED=0 falls back to a
+// stub with no constants).
+func modCmd() hk.Modifier    { return hk.ModCtrl }
+func modCtrl() hk.Modifier   { return hk.ModCtrl }
+func modOption() hk.Modifier { return hk.Mod1 }
+func modShift() hk.Modifier  { return hk.ModShift }

internal/infrastructure/hotkey/hotkey_other.go

@@ -1,11 +0,0 @@
-//go:build !darwin
-
-package hotkey
-
-import hk "golang.design/x/hotkey"
-
-// On Windows / Linux we map "cmd" to Ctrl so the same config string works
-// across platforms; "option" is treated as Alt.
-func modCmd() hk.Modifier    { return hk.ModCtrl }
-func modCtrl() hk.Modifier   { return hk.ModCtrl }
-func modOption() hk.Modifier { return hk.ModAlt }

internal/infrastructure/hotkey/hotkey_unsupported.go

@@ -0,0 +1,25 @@
+//go:build !windows && !cgo
+
+package hotkey
+
+import hk "golang.design/x/hotkey"
+
+// This file covers the configuration where golang.design/x/hotkey compiles its
+// cgo-less stub (any non-Windows platform built with CGO_ENABLED=0). In that
+// stub the package defines the Modifier/Key types but no Mod*/Key* constants,
+// and Register panics at runtime. We still provide the package-internal
+// helpers so that snapgo keeps cross-compiling (e.g. `go vet`, editor analysis,
+// or CI cross-builds) without pulling in a C toolchain.
+//
+// The returned values are inert zero modifiers and lookupKey always reports
+// "unsupported": callers on this build cannot register a real global hotkey,
+// so surfacing an "unsupported token" parse error is preferable to reaching
+// the upstream panic.
+func modCmd() hk.Modifier    { return 0 }
+func modCtrl() hk.Modifier   { return 0 }
+func modOption() hk.Modifier { return 0 }
+func modShift() hk.Modifier  { return 0 }
+
+// lookupKey has no key constants to map against in the cgo-less stub, so it
+// always reports the token as unsupported.
+func lookupKey(string) (hk.Key, bool) { return 0, false }

internal/infrastructure/hotkey/hotkey_windows.go

@@ -0,0 +1,13 @@
+//go:build windows
+
+package hotkey
+
+import hk "golang.design/x/hotkey"
+
+// On Windows we map "cmd" to Ctrl so the same config string ("cmd+shift+a")
+// stays meaningful across platforms; "option" is treated as Alt. The Windows
+// backend does not require cgo, hence the single-tag guard.
+func modCmd() hk.Modifier    { return hk.ModCtrl }
+func modCtrl() hk.Modifier   { return hk.ModCtrl }
+func modOption() hk.Modifier { return hk.ModAlt }
+func modShift() hk.Modifier  { return hk.ModShift }

internal/infrastructure/hotkey/keys.go

@@ -1,9 +1,15 @@
+//go:build windows || cgo
+
 package hotkey
 
 import hk "golang.design/x/hotkey"
 
 // lookupKey maps a token from the user-supplied hotkey spec to a hk.Key.
 //
+// The Key* constants only exist in the platform backends that ship them
+// (windows, or the cgo-backed darwin/linux implementations); the cgo-less stub
+// in hotkey_unsupported.go provides a fallback lookupKey for the complement.
+//
 // The map is intentionally exhaustive over the alphanumeric set so we never
 // rely on an assumption that hk.KeyA..hk.KeyZ are contiguous values — the
 // upstream package gives no such guarantee.

internal/infrastructure/ocr/client.go

@@ -0,0 +1,701 @@
+// Package ocr contains cloud OCR adapters.
+package ocr
+
+import (
+	"bytes"
+	"context"
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/mmmy/snapgo/internal/application"
+	"github.com/mmmy/snapgo/internal/domain"
+)
+
+// Client calls one configured OCR provider.
+type Client struct {
+	providerID string
+	cfg        domain.OCRProviderConfig
+	httpClient *http.Client
+	now        func() time.Time
+	nonce      func() string
+}
+
+var _ application.OCRRecognizer = (*Client)(nil)
+
+// NewClient validates cfg and returns a reusable OCR client.
+func NewClient(providerID string, cfg domain.OCRProviderConfig) (*Client, error) {
+	if strings.TrimSpace(cfg.Endpoint) == "" {
+		return nil, fmt.Errorf("ocr endpoint is required")
+	}
+	if strings.TrimSpace(cfg.AccessKeyID) == "" {
+		return nil, fmt.Errorf("ocr access key id is required")
+	}
+	if strings.TrimSpace(cfg.AccessKeySecret) == "" {
+		return nil, fmt.Errorf("ocr access key secret is required")
+	}
+	if strings.TrimSpace(cfg.Action) == "" {
+		return nil, fmt.Errorf("ocr action is required")
+	}
+	if strings.TrimSpace(cfg.Version) == "" {
+		return nil, fmt.Errorf("ocr version is required")
+	}
+	switch providerID {
+	case domain.OCRProviderAliyun:
+	case domain.OCRProviderVolcengine:
+		if strings.TrimSpace(cfg.Region) == "" {
+			return nil, fmt.Errorf("volcengine ocr region is required")
+		}
+		if strings.TrimSpace(cfg.Service) == "" {
+			return nil, fmt.Errorf("volcengine ocr service is required")
+		}
+	default:
+		return nil, fmt.Errorf("unsupported ocr provider %q", providerID)
+	}
+	timeout := cfg.TimeoutSecs
+	if timeout <= 0 {
+		timeout = 30
+	}
+	return &Client{
+		providerID: providerID,
+		cfg:        cfg,
+		httpClient: &http.Client{Timeout: time.Duration(timeout) * time.Second},
+		now:        time.Now,
+		nonce:      randomNonce,
+	}, nil
+}
+
+// RecognizeText extracts visible text from a PNG screenshot.
+func (c *Client) RecognizeText(ctx context.Context, pngBytes []byte) (string, error) {
+	if len(pngBytes) == 0 {
+		return "", fmt.Errorf("empty screenshot")
+	}
+	switch c.providerID {
+	case domain.OCRProviderAliyun:
+		return c.recognizeAliyun(ctx, pngBytes)
+	case domain.OCRProviderVolcengine:
+		return c.recognizeVolcengine(ctx, pngBytes)
+	default:
+		return "", fmt.Errorf("unsupported ocr provider %q", c.providerID)
+	}
+}
+
+func (c *Client) recognizeAliyun(ctx context.Context, pngBytes []byte) (string, error) {
+	endpoint, err := parseEndpoint(c.cfg.Endpoint)
+	if err != nil {
+		return "", err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint.String(), bytes.NewReader(pngBytes))
+	if err != nil {
+		return "", fmt.Errorf("build aliyun ocr request: %w", err)
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("Content-Type", "application/octet-stream")
+	c.signAliyun(req, pngBytes)
+	return c.doOCRRequest(req, "aliyun ocr")
+}
+
+func (c *Client) recognizeVolcengine(ctx context.Context, pngBytes []byte) (string, error) {
+	endpoint, err := parseEndpoint(c.cfg.Endpoint)
+	if err != nil {
+		return "", err
+	}
+	query := endpoint.Query()
+	query.Set("Action", c.cfg.Action)
+	query.Set("Version", c.cfg.Version)
+	endpoint.RawQuery = query.Encode()
+
+	body := map[string]string{
+		"image_base64": base64.StdEncoding.EncodeToString(pngBytes),
+	}
+	payload, err := json.Marshal(body)
+	if err != nil {
+		return "", fmt.Errorf("marshal volcengine ocr request: %w", err)
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint.String(), bytes.NewReader(payload))
+	if err != nil {
+		return "", fmt.Errorf("build volcengine ocr request: %w", err)
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("Content-Type", "application/json")
+	c.signVolcengine(req, payload)
+	return c.doOCRRequest(req, "volcengine ocr")
+}
+
+func (c *Client) doOCRRequest(req *http.Request, label string) (string, error) {
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("%s request: %w", label, err)
+	}
+	defer resp.Body.Close()
+	data, _ := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return "", fmt.Errorf("%s status %d: %s", label, resp.StatusCode, compactBody(data))
+	}
+	text, err := parseOCRText(data)
+	if err != nil {
+		return "", fmt.Errorf("%s response: %w", label, err)
+	}
+	return text, nil
+}
+
+func (c *Client) signAliyun(req *http.Request, payload []byte) {
+	now := c.now().UTC()
+	payloadHash := sha256Hex(payload)
+	nonce := c.nonce()
+
+	req.Header.Set("x-acs-action", c.cfg.Action)
+	req.Header.Set("x-acs-version", c.cfg.Version)
+	req.Header.Set("x-acs-date", now.Format("2006-01-02T15:04:05Z"))
+	req.Header.Set("x-acs-signature-nonce", nonce)
+	req.Header.Set("x-acs-content-sha256", payloadHash)
+
+	signedHeaders := []string{
+		"content-type",
+		"host",
+		"x-acs-action",
+		"x-acs-content-sha256",
+		"x-acs-date",
+		"x-acs-signature-nonce",
+		"x-acs-version",
+	}
+	canonicalHeaders := canonicalHeaders(req, signedHeaders)
+	canonicalRequest := strings.Join([]string{
+		req.Method,
+		canonicalURI(req.URL),
+		canonicalQuery(req.URL),
+		canonicalHeaders,
+		strings.Join(signedHeaders, ";"),
+		payloadHash,
+	}, "\n")
+	stringToSign := "ACS3-HMAC-SHA256\n" + sha256Hex([]byte(canonicalRequest))
+	signature := hmacSHA256Hex([]byte(c.cfg.AccessKeySecret), []byte(stringToSign))
+	req.Header.Set(
+		"Authorization",
+		fmt.Sprintf("ACS3-HMAC-SHA256 Credential=%s,SignedHeaders=%s,Signature=%s",
+			c.cfg.AccessKeyID,
+			strings.Join(signedHeaders, ";"),
+			signature,
+		),
+	)
+}
+
+func (c *Client) signVolcengine(req *http.Request, payload []byte) {
+	now := c.now().UTC()
+	xDate := now.Format("20060102T150405Z")
+	shortDate := now.Format("20060102")
+	payloadHash := sha256Hex(payload)
+
+	req.Header.Set("X-Date", xDate)
+	req.Header.Set("X-Content-Sha256", payloadHash)
+
+	signedHeaders := []string{
+		"content-type",
+		"host",
+		"x-content-sha256",
+		"x-date",
+	}
+	canonicalHeaders := canonicalHeaders(req, signedHeaders)
+	canonicalRequest := strings.Join([]string{
+		req.Method,
+		canonicalURI(req.URL),
+		canonicalQuery(req.URL),
+		canonicalHeaders,
+		strings.Join(signedHeaders, ";"),
+		payloadHash,
+	}, "\n")
+	scope := strings.Join([]string{shortDate, c.cfg.Region, c.cfg.Service, "request"}, "/")
+	stringToSign := strings.Join([]string{
+		"HMAC-SHA256",
+		xDate,
+		scope,
+		sha256Hex([]byte(canonicalRequest)),
+	}, "\n")
+	signingKey := volcengineSigningKey(c.cfg.AccessKeySecret, shortDate, c.cfg.Region, c.cfg.Service)
+	signature := hmacSHA256Hex(signingKey, []byte(stringToSign))
+	req.Header.Set(
+		"Authorization",
+		fmt.Sprintf("HMAC-SHA256 Credential=%s/%s, SignedHeaders=%s, Signature=%s",
+			c.cfg.AccessKeyID,
+			scope,
+			strings.Join(signedHeaders, ";"),
+			signature,
+		),
+	)
+}
+
+func parseEndpoint(raw string) (*url.URL, error) {
+	endpoint := strings.TrimSpace(raw)
+	if endpoint == "" {
+		return nil, fmt.Errorf("ocr endpoint is required")
+	}
+	if !strings.Contains(endpoint, "://") {
+		endpoint = "https://" + endpoint
+	}
+	parsed, err := url.Parse(endpoint)
+	if err != nil {
+		return nil, fmt.Errorf("parse ocr endpoint: %w", err)
+	}
+	if parsed.Scheme == "" || parsed.Host == "" {
+		return nil, fmt.Errorf("invalid ocr endpoint %q", raw)
+	}
+	if parsed.Path == "" {
+		parsed.Path = "/"
+	}
+	return parsed, nil
+}
+
+func parseOCRText(data []byte) (string, error) {
+	var root any
+	if err := json.Unmarshal(data, &root); err != nil {
+		return "", fmt.Errorf("decode json: %w", err)
+	}
+	if msg := responseError(root); msg != "" {
+		return "", errors.New(msg)
+	}
+	if text := normalizeOCRText(extractOverallOCRText(root, "")); text != "" {
+		return text, nil
+	}
+	parts := collectOCRParts(root, "")
+	if len(parts) == 0 {
+		return "", fmt.Errorf("no text found")
+	}
+	return strings.Join(dedupeNonEmpty(parts), "\n"), nil
+}
+
+func responseError(v any) string {
+	obj, ok := v.(map[string]any)
+	if !ok {
+		return ""
+	}
+	if meta, ok := obj["ResponseMetadata"].(map[string]any); ok {
+		if errObj, ok := meta["Error"].(map[string]any); ok {
+			if msg := stringValue(errObj["Message"]); msg != "" {
+				return msg
+			}
+			if code := stringValue(errObj["Code"]); code != "" {
+				return code
+			}
+		}
+	}
+	if errObj, ok := obj["Error"].(map[string]any); ok {
+		if msg := stringValue(errObj["Message"]); msg != "" {
+			return msg
+		}
+		if msg := stringValue(errObj["message"]); msg != "" {
+			return msg
+		}
+	}
+	if code, ok := numericCode(obj["code"]); ok && code != 0 && code != 10000 {
+		if msg := stringValue(obj["message"]); msg != "" {
+			return msg
+		}
+		if msg := stringValue(obj["msg"]); msg != "" {
+			return msg
+		}
+		return fmt.Sprintf("provider code %.0f", code)
+	}
+	if code := stringValue(obj["Code"]); code != "" && !isSuccessCode(code) {
+		if msg := stringValue(obj["Message"]); msg != "" {
+			return msg
+		}
+		return code
+	}
+	return ""
+}
+
+func extractOverallOCRText(v any, parentKey string) string {
+	switch value := v.(type) {
+	case string:
+		text := strings.TrimSpace(value)
+		if text == "" {
+			return ""
+		}
+		if looksLikeJSON(text) {
+			var nested any
+			if err := json.Unmarshal([]byte(text), &nested); err == nil {
+				if nestedText := extractOverallOCRText(nested, parentKey); nestedText != "" {
+					return nestedText
+				}
+			}
+		}
+		if isAggregateContainerKey(parentKey) {
+			return text
+		}
+		return ""
+	case map[string]any:
+		for _, key := range aggregateTextKeys() {
+			if child, ok := value[key]; ok {
+				if text := extractOverallOCRText(child, key); text != "" {
+					return text
+				}
+			}
+		}
+		for _, key := range responseContainerKeys() {
+			if child, ok := value[key]; ok {
+				if text := extractOverallOCRText(child, key); text != "" {
+					return text
+				}
+			}
+		}
+		keys := make([]string, 0, len(value))
+		for key := range value {
+			keys = append(keys, key)
+		}
+		sort.Strings(keys)
+		for _, key := range keys {
+			if isAggregateTextKey(key) ||
+				isResponseContainerKey(key) ||
+				isBlockContainerKey(key) ||
+				isMetadataKey(key) {
+				continue
+			}
+			if text := extractOverallOCRText(value[key], key); text != "" {
+				return text
+			}
+		}
+		return ""
+	default:
+		return ""
+	}
+}
+
+func collectOCRParts(v any, parentKey string) []string {
+	switch value := v.(type) {
+	case string:
+		text := strings.TrimSpace(value)
+		if text == "" {
+			return nil
+		}
+		if looksLikeJSON(text) {
+			var nested any
+			if err := json.Unmarshal([]byte(text), &nested); err == nil {
+				return collectOCRParts(nested, parentKey)
+			}
+		}
+		if isTextKey(parentKey) || isContainerTextKey(parentKey) {
+			return []string{text}
+		}
+		return nil
+	case []any:
+		parts := make([]string, 0, len(value))
+		for _, item := range value {
+			parts = append(parts, collectOCRParts(item, parentKey)...)
+		}
+		return parts
+	case map[string]any:
+		parts := make([]string, 0)
+		for _, key := range priorityOCRKeys() {
+			if child, ok := value[key]; ok {
+				parts = append(parts, collectOCRParts(child, key)...)
+			}
+		}
+		keys := make([]string, 0, len(value))
+		for key := range value {
+			keys = append(keys, key)
+		}
+		sort.Strings(keys)
+		for _, key := range keys {
+			if isPriorityOCRKey(key) || isMetadataKey(key) {
+				continue
+			}
+			parts = append(parts, collectOCRParts(value[key], key)...)
+		}
+		return parts
+	default:
+		return nil
+	}
+}
+
+func aggregateTextKeys() []string {
+	return []string{
+		"content",
+		"Content",
+		"text",
+		"Text",
+		"full_text",
+		"FullText",
+		"fullText",
+		"plain_text",
+		"PlainText",
+		"plainText",
+		"recognized_text",
+		"RecognizedText",
+		"recognizedText",
+		"ocr_text",
+		"OCRText",
+		"ocrText",
+	}
+}
+
+func responseContainerKeys() []string {
+	return []string{
+		"Data",
+		"data",
+		"Result",
+		"result",
+	}
+}
+
+func priorityOCRKeys() []string {
+	return []string{
+		"Data",
+		"data",
+		"Result",
+		"result",
+		"content",
+		"Content",
+		"text",
+		"Text",
+		"DetectedText",
+		"detected_text",
+		"line_text",
+		"LineText",
+		"line_texts",
+		"LineTexts",
+		"word",
+		"Word",
+		"words",
+		"Words",
+		"words_result",
+		"WordsResult",
+		"prism_wordsInfo",
+		"prism_words_info",
+		"ocr_infos",
+		"OCRInfos",
+		"items",
+		"Items",
+		"blocks",
+		"Blocks",
+		"regions",
+		"Regions",
+	}
+}
+
+func isAggregateTextKey(key string) bool {
+	for _, item := range aggregateTextKeys() {
+		if item == key {
+			return true
+		}
+	}
+	return false
+}
+
+func isAggregateContainerKey(key string) bool {
+	return isAggregateTextKey(key) || isResponseContainerKey(key)
+}
+
+func isResponseContainerKey(key string) bool {
+	for _, item := range responseContainerKeys() {
+		if item == key {
+			return true
+		}
+	}
+	return false
+}
+
+func isBlockContainerKey(key string) bool {
+	switch normalizeKey(key) {
+	case "wordsresult", "prismwordsinfo", "prismwords", "ocrinfos", "items",
+		"blocks", "regions", "words", "linetexts", "lines", "cells":
+		return true
+	default:
+		return false
+	}
+}
+
+func isPriorityOCRKey(key string) bool {
+	for _, item := range priorityOCRKeys() {
+		if item == key {
+			return true
+		}
+	}
+	return false
+}
+
+func isTextKey(key string) bool {
+	switch normalizeKey(key) {
+	case "content", "text", "detectedtext", "linetext", "word", "words", "value":
+		return true
+	default:
+		return false
+	}
+}
+
+func isContainerTextKey(key string) bool {
+	switch normalizeKey(key) {
+	case "data", "result", "linetexts", "texts":
+		return true
+	default:
+		return false
+	}
+}
+
+func isMetadataKey(key string) bool {
+	switch normalizeKey(key) {
+	case "requestid", "request", "code", "status", "statuscode", "success",
+		"error", "errors", "message", "msg", "cost", "angle", "probability",
+		"confidence", "height", "width", "left", "top", "right", "bottom",
+		"x", "y", "responsemetadata":
+		return true
+	default:
+		return false
+	}
+}
+
+func normalizeKey(key string) string {
+	key = strings.ToLower(key)
+	key = strings.ReplaceAll(key, "_", "")
+	key = strings.ReplaceAll(key, "-", "")
+	return key
+}
+
+func dedupeNonEmpty(parts []string) []string {
+	seen := map[string]struct{}{}
+	out := make([]string, 0, len(parts))
+	for _, part := range parts {
+		for _, line := range strings.Split(part, "\n") {
+			line = strings.TrimSpace(line)
+			if line == "" {
+				continue
+			}
+			if _, ok := seen[line]; ok {
+				continue
+			}
+			seen[line] = struct{}{}
+			out = append(out, line)
+		}
+	}
+	return out
+}
+
+func normalizeOCRText(text string) string {
+	lines := strings.Split(strings.TrimSpace(text), "\n")
+	out := make([]string, 0, len(lines))
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line != "" {
+			out = append(out, line)
+		}
+	}
+	return strings.Join(out, "\n")
+}
+
+func looksLikeJSON(text string) bool {
+	return strings.HasPrefix(text, "{") || strings.HasPrefix(text, "[")
+}
+
+func stringValue(v any) string {
+	if s, ok := v.(string); ok {
+		return strings.TrimSpace(s)
+	}
+	return ""
+}
+
+func numericCode(v any) (float64, bool) {
+	switch n := v.(type) {
+	case float64:
+		return n, true
+	case int:
+		return float64(n), true
+	case json.Number:
+		f, err := n.Float64()
+		return f, err == nil
+	default:
+		return 0, false
+	}
+}
+
+func isSuccessCode(code string) bool {
+	switch strings.ToLower(strings.TrimSpace(code)) {
+	case "", "ok", "success", "200", "10000":
+		return true
+	default:
+		return false
+	}
+}
+
+func canonicalURI(u *url.URL) string {
+	if u == nil || u.EscapedPath() == "" {
+		return "/"
+	}
+	return u.EscapedPath()
+}
+
+func canonicalQuery(u *url.URL) string {
+	if u == nil || u.RawQuery == "" {
+		return ""
+	}
+	values, _ := url.ParseQuery(u.RawQuery)
+	return values.Encode()
+}
+
+func canonicalHeaders(req *http.Request, signedHeaders []string) string {
+	lines := make([]string, 0, len(signedHeaders))
+	for _, key := range signedHeaders {
+		var value string
+		if key == "host" {
+			value = req.URL.Host
+		} else {
+			value = req.Header.Get(key)
+		}
+		lines = append(lines, key+":"+normalizeHeaderValue(value)+"\n")
+	}
+	return strings.Join(lines, "")
+}
+
+func normalizeHeaderValue(value string) string {
+	return strings.Join(strings.Fields(strings.TrimSpace(value)), " ")
+}
+
+func volcengineSigningKey(secret, date, region, service string) []byte {
+	kDate := hmacSHA256([]byte(secret), []byte(date))
+	kRegion := hmacSHA256(kDate, []byte(region))
+	kService := hmacSHA256(kRegion, []byte(service))
+	return hmacSHA256(kService, []byte("request"))
+}
+
+func hmacSHA256(key, data []byte) []byte {
+	mac := hmac.New(sha256.New, key)
+	mac.Write(data)
+	return mac.Sum(nil)
+}
+
+func hmacSHA256Hex(key, data []byte) string {
+	return hex.EncodeToString(hmacSHA256(key, data))
+}
+
+func sha256Hex(data []byte) string {
+	sum := sha256.Sum256(data)
+	return hex.EncodeToString(sum[:])
+}
+
+func randomNonce() string {
+	buf := make([]byte, 16)
+	if _, err := rand.Read(buf); err != nil {
+		return fmt.Sprintf("%d", time.Now().UnixNano())
+	}
+	return hex.EncodeToString(buf)
+}
+
+func compactBody(data []byte) string {
+	text := strings.TrimSpace(string(data))
+	if text == "" {
+		return "<empty body>"
+	}
+	if len(text) > 800 {
+		return text[:800] + "..."
+	}
+	return text
+}

internal/infrastructure/ocr/client_test.go

@@ -0,0 +1,177 @@
+package ocr
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"io"
+	"net/http"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/mmmy/snapgo/internal/domain"
+)
+
+type roundTripFunc func(*http.Request) (*http.Response, error)
+
+func (f roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req)
+}
+
+func TestAliyunRecognizeTextSignsRawPNGRequest(t *testing.T) {
+	var requestBody []byte
+	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
+		if r.URL.Host != "ocr-api.cn-hangzhou.aliyuncs.com" {
+			t.Fatalf("unexpected host %s", r.URL.Host)
+		}
+		if got := r.Header.Get("x-acs-action"); got != "RecognizeGeneral" {
+			t.Fatalf("unexpected action %q", got)
+		}
+		if got := r.Header.Get("x-acs-version"); got != "2021-07-07" {
+			t.Fatalf("unexpected version %q", got)
+		}
+		if got := r.Header.Get("x-acs-date"); got != "2026-07-08T01:02:03Z" {
+			t.Fatalf("unexpected date %q", got)
+		}
+		if got := r.Header.Get("Authorization"); !strings.Contains(got, "ACS3-HMAC-SHA256 Credential=ak") {
+			t.Fatalf("unexpected auth header %q", got)
+		}
+		var err error
+		requestBody, err = io.ReadAll(r.Body)
+		if err != nil {
+			t.Fatalf("read body: %v", err)
+		}
+		return &http.Response{
+			StatusCode: http.StatusOK,
+			Header:     http.Header{"Content-Type": []string{"application/json"}},
+			Body: io.NopCloser(bytes.NewBufferString(
+				`{"Data":"{\"content\":\"第一行\\n第二行\"}"}`,
+			)),
+		}, nil
+	})
+
+	client, err := NewClient(domain.OCRProviderAliyun, domain.OCRProviderConfig{
+		Endpoint:        "https://ocr-api.cn-hangzhou.aliyuncs.com",
+		AccessKeyID:     "ak",
+		AccessKeySecret: "sk",
+		Action:          "RecognizeGeneral",
+		Version:         "2021-07-07",
+	})
+	if err != nil {
+		t.Fatalf("new client: %v", err)
+	}
+	client.httpClient.Transport = transport
+	client.now = func() time.Time { return time.Date(2026, 7, 8, 1, 2, 3, 0, time.UTC) }
+	client.nonce = func() string { return "nonce" }
+
+	text, err := client.RecognizeText(context.Background(), []byte("png"))
+	if err != nil {
+		t.Fatalf("recognize text: %v", err)
+	}
+	if string(requestBody) != "png" {
+		t.Fatalf("expected raw png body, got %q", string(requestBody))
+	}
+	if text != "第一行\n第二行" {
+		t.Fatalf("unexpected OCR text %q", text)
+	}
+}
+
+func TestVolcengineRecognizeTextSignsBase64JSONRequest(t *testing.T) {
+	var requestBody map[string]string
+	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
+		if got := r.URL.Query().Get("Action"); got != "OCRNormal" {
+			t.Fatalf("unexpected action %q", got)
+		}
+		if got := r.URL.Query().Get("Version"); got != "2020-08-26" {
+			t.Fatalf("unexpected version %q", got)
+		}
+		if got := r.Header.Get("X-Date"); got != "20260708T010203Z" {
+			t.Fatalf("unexpected x-date %q", got)
+		}
+		if got := r.Header.Get("Authorization"); !strings.Contains(got, "HMAC-SHA256 Credential=ak/20260708/cn-north-1/cv/request") {
+			t.Fatalf("unexpected auth header %q", got)
+		}
+		if err := json.NewDecoder(r.Body).Decode(&requestBody); err != nil {
+			t.Fatalf("decode request: %v", err)
+		}
+		return &http.Response{
+			StatusCode: http.StatusOK,
+			Header:     http.Header{"Content-Type": []string{"application/json"}},
+			Body: io.NopCloser(bytes.NewBufferString(
+				`{"ResponseMetadata":{"RequestId":"r"},"Result":{"LineTexts":["你好","世界"]}}`,
+			)),
+		}, nil
+	})
+
+	client, err := NewClient(domain.OCRProviderVolcengine, domain.OCRProviderConfig{
+		Endpoint:        "https://visual.volcengineapi.com",
+		AccessKeyID:     "ak",
+		AccessKeySecret: "sk",
+		Region:          "cn-north-1",
+		Service:         "cv",
+		Action:          "OCRNormal",
+		Version:         "2020-08-26",
+	})
+	if err != nil {
+		t.Fatalf("new client: %v", err)
+	}
+	client.httpClient.Transport = transport
+	client.now = func() time.Time { return time.Date(2026, 7, 8, 1, 2, 3, 0, time.UTC) }
+
+	text, err := client.RecognizeText(context.Background(), []byte("png"))
+	if err != nil {
+		t.Fatalf("recognize text: %v", err)
+	}
+	if requestBody["image_base64"] != base64.StdEncoding.EncodeToString([]byte("png")) {
+		t.Fatalf("expected base64 image body, got %#v", requestBody)
+	}
+	if text != "你好\n世界" {
+		t.Fatalf("unexpected OCR text %q", text)
+	}
+}
+
+func TestParseOCRTextSupportsWordsResult(t *testing.T) {
+	text, err := parseOCRText([]byte(`{"data":{"words_result":[{"words":"foo"},{"words":"bar"}]}}`))
+	if err != nil {
+		t.Fatalf("parse ocr text: %v", err)
+	}
+	if text != "foo\nbar" {
+		t.Fatalf("unexpected OCR text %q", text)
+	}
+}
+
+func TestParseOCRTextPrefersOverallContentOverBlocks(t *testing.T) {
+	text, err := parseOCRText([]byte(`{
+		"Data": "{\"content\":\"整体识别文本\",\"prism_wordsInfo\":[{\"word\":\"整体\"},{\"word\":\"识别\"},{\"word\":\"文本\"}]}"
+	}`))
+	if err != nil {
+		t.Fatalf("parse ocr text: %v", err)
+	}
+	if text != "整体识别文本" {
+		t.Fatalf("expected overall content only, got %q", text)
+	}
+}
+
+func TestParseOCRTextPrefersResultTextOverWordsResult(t *testing.T) {
+	text, err := parseOCRText([]byte(`{
+		"Result": {
+			"text": "hello world",
+			"words_result": [{"words":"hello"},{"words":"world"}]
+		}
+	}`))
+	if err != nil {
+		t.Fatalf("parse ocr text: %v", err)
+	}
+	if text != "hello world" {
+		t.Fatalf("expected result text only, got %q", text)
+	}
+}
+
+func TestParseOCRTextReturnsProviderError(t *testing.T) {
+	_, err := parseOCRText([]byte(`{"ResponseMetadata":{"Error":{"Code":"BadRequest","Message":"bad image"}}}`))
+	if err == nil || !strings.Contains(err.Error(), "bad image") {
+		t.Fatalf("expected provider error, got %v", err)
+	}
+}

internal/infrastructure/oss/s3.go

@@ -101,6 +101,20 @@ func (p *S3Provider) BuildPublicURL(key string) string {
 	return endpoint + "/" + p.cfg.Bucket + "/" + key
 }
 
+// Delete removes a previously uploaded object by key.
+//
+// The summary pipeline uses this to clean up the temporary screenshot it had
+// to upload only so a remote multimodal model could fetch it via public URL.
+func (p *S3Provider) Delete(ctx context.Context, key string) error {
+	if _, err := p.client.DeleteObject(ctx, &s3.DeleteObjectInput{
+		Bucket: awsv2.String(p.cfg.Bucket),
+		Key:    awsv2.String(key),
+	}); err != nil {
+		return fmt.Errorf("s3 delete object: %w", err)
+	}
+	return nil
+}
+
 // TestConnection performs a small put + delete to verify credentials and
 // bucket reachability. Used by the "Test connection" button in settings.
 func (p *S3Provider) TestConnection(ctx context.Context) error {

internal/infrastructure/ssh/sftp_uploader.go

@@ -0,0 +1,213 @@
+package ssh
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"path"
+	"strings"
+	"time"
+
+	"github.com/pkg/sftp"
+
+	"github.com/mmmy/snapgo/internal/domain"
+)
+
+// SFTPUploader transfers screenshots through the SSH File Transfer Protocol.
+// It lives beside the SCP client so both protocols share the same SSH
+// authentication and host-key implementation without duplicating credential
+// discovery code.
+type SFTPUploader struct {
+	cfg domain.FTPConfig
+}
+
+// NewSFTPUploader returns a short-lived SFTP adapter. A fresh SSH/SFTP
+// connection is opened for every upload or connection probe.
+func NewSFTPUploader(cfg domain.FTPConfig) *SFTPUploader {
+	return &SFTPUploader{cfg: cfg}
+}
+
+func (u *SFTPUploader) sshConfig() domain.SSHConfig {
+	return domain.SSHConfig{
+		Host:               u.cfg.Host,
+		Port:               u.cfg.Port,
+		User:               u.cfg.User,
+		AuthMethod:         u.cfg.AuthMethod,
+		Password:           u.cfg.Password,
+		StrictHostKey:      u.cfg.StrictHostKey,
+		KnownHostsPath:     u.cfg.KnownHostsPath,
+		ConnectTimeoutSecs: u.cfg.ConnectTimeoutSecs,
+	}
+}
+
+func (u *SFTPUploader) dial(ctx context.Context) (*Client, *sftp.Client, error) {
+	sshClient, err := Dial(ctx, u.sshConfig())
+	if err != nil {
+		return nil, nil, fmt.Errorf("sftp: %w", err)
+	}
+	sftpClient, err := sftp.NewClient(sshClient.client)
+	if err != nil {
+		_ = sshClient.Close()
+		return nil, nil, fmt.Errorf("sftp: start subsystem: %w", err)
+	}
+	return sshClient, sftpClient, nil
+}
+
+// Upload writes data to a temporary file and atomically exposes it at the
+// final relative path after the transfer completes.
+func (u *SFTPUploader) Upload(ctx context.Context, remoteRelPath string, data []byte) error {
+	cleaned, err := validateSFTPRemotePath(remoteRelPath)
+	if err != nil {
+		return err
+	}
+	sshClient, sftpClient, err := u.dial(ctx)
+	if err != nil {
+		return err
+	}
+	done := closeSFTPOnCancel(ctx, sshClient, sftpClient)
+	defer sshClient.Close()
+	defer sftpClient.Close()
+	defer close(done)
+
+	dir := path.Dir(cleaned)
+	if dir != "." {
+		if err := sftpClient.MkdirAll(dir); err != nil {
+			return fmt.Errorf("sftp: create directory %s: %w", dir, err)
+		}
+	}
+
+	tempPath := path.Join(dir, temporarySFTPName(path.Base(cleaned)))
+	removeTemp := true
+	defer func() {
+		if removeTemp {
+			_ = sftpClient.Remove(tempPath)
+		}
+	}()
+
+	file, err := sftpClient.OpenFile(tempPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC)
+	if err != nil {
+		return fmt.Errorf("sftp: create temporary file: %w", err)
+	}
+	reader := &sftpContextReader{ctx: ctx, reader: bytes.NewReader(data)}
+	_, copyErr := io.Copy(file, reader)
+	if copyErr == nil {
+		copyErr = file.Chmod(0o644)
+	}
+	closeErr := file.Close()
+	if copyErr != nil {
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+		return fmt.Errorf("sftp: write %s: %w", cleaned, copyErr)
+	}
+	if closeErr != nil {
+		return fmt.Errorf("sftp: close %s: %w", cleaned, closeErr)
+	}
+	if err := sftpClient.Rename(tempPath, cleaned); err != nil {
+		return fmt.Errorf("sftp: commit %s: %w", cleaned, err)
+	}
+	removeTemp = false
+	sshLog().Info("SFTP upload ok", "remote_path", cleaned, "size", len(data))
+	return nil
+}
+
+// TestConnection verifies SFTP write/delete permissions with a small probe.
+func (u *SFTPUploader) TestConnection(ctx context.Context) error {
+	probe, err := sftpProbePath(u.cfg.PathPrefix)
+	if err != nil {
+		return err
+	}
+	sshClient, sftpClient, err := u.dial(ctx)
+	if err != nil {
+		return err
+	}
+	done := closeSFTPOnCancel(ctx, sshClient, sftpClient)
+	defer sshClient.Close()
+	defer sftpClient.Close()
+	defer close(done)
+
+	dir := path.Dir(probe)
+	if dir != "." {
+		if err := sftpClient.MkdirAll(dir); err != nil {
+			return fmt.Errorf("sftp probe: create directory: %w", err)
+		}
+	}
+	file, err := sftpClient.OpenFile(probe, os.O_WRONLY|os.O_CREATE|os.O_TRUNC)
+	if err != nil {
+		return fmt.Errorf("sftp probe: create: %w", err)
+	}
+	_, writeErr := file.Write([]byte("snapgo"))
+	closeErr := file.Close()
+	if writeErr != nil {
+		_ = sftpClient.Remove(probe)
+		return fmt.Errorf("sftp probe: write: %w", writeErr)
+	}
+	if closeErr != nil {
+		_ = sftpClient.Remove(probe)
+		return fmt.Errorf("sftp probe: close: %w", closeErr)
+	}
+	if err := sftpClient.Remove(probe); err != nil {
+		return fmt.Errorf("sftp probe: delete: %w", err)
+	}
+	return nil
+}
+
+func closeSFTPOnCancel(ctx context.Context, sshClient *Client, sftpClient *sftp.Client) chan struct{} {
+	done := make(chan struct{})
+	go func() {
+		select {
+		case <-ctx.Done():
+			_ = sftpClient.Close()
+			_ = sshClient.Close()
+		case <-done:
+		}
+	}()
+	return done
+}
+
+func validateSFTPRemotePath(value string) (string, error) {
+	value = strings.TrimSpace(value)
+	if value == "" || strings.HasPrefix(value, "/") || strings.HasPrefix(value, "~") {
+		return "", fmt.Errorf("sftp: remote path must be relative to the login directory")
+	}
+	if strings.ContainsAny(value, "\x00\r\n\\") {
+		return "", fmt.Errorf("sftp: remote path contains an invalid character")
+	}
+	for _, segment := range strings.Split(value, "/") {
+		if segment == ".." {
+			return "", fmt.Errorf("sftp: remote path must not contain '..'")
+		}
+	}
+	cleaned := path.Clean(value)
+	if cleaned == "." || path.Base(cleaned) == "." || path.Base(cleaned) == ".." {
+		return "", fmt.Errorf("sftp: remote filename is empty")
+	}
+	return cleaned, nil
+}
+
+func sftpProbePath(prefix string) (string, error) {
+	prefix = strings.TrimSpace(prefix)
+	prefix = strings.TrimPrefix(prefix, "~")
+	prefix = strings.TrimLeft(prefix, "/")
+	return validateSFTPRemotePath(path.Join(prefix, fmt.Sprintf(".snapgo-probe-%d", time.Now().UnixNano())))
+}
+
+func temporarySFTPName(base string) string {
+	return fmt.Sprintf(".%s.snapgo-upload-%d", base, time.Now().UnixNano())
+}
+
+type sftpContextReader struct {
+	ctx    context.Context
+	reader io.Reader
+}
+
+func (r *sftpContextReader) Read(p []byte) (int, error) {
+	select {
+	case <-r.ctx.Done():
+		return 0, r.ctx.Err()
+	default:
+		return r.reader.Read(p)
+	}
+}

internal/infrastructure/ssh/sftp_uploader_test.go

@@ -0,0 +1,28 @@
+package ssh
+
+import "testing"
+
+func TestValidateSFTPRemotePathRejectsTraversal(t *testing.T) {
+	if got, err := validateSFTPRemotePath("snapgo/2026/image.png"); err != nil || got != "snapgo/2026/image.png" {
+		t.Fatalf("valid path: got %q err=%v", got, err)
+	}
+
+	for _, value := range []string{
+		"",
+		"/absolute/image.png",
+		"~/image.png",
+		"../image.png",
+		"snapgo/../../image.png",
+		"snapgo\\image.png",
+	} {
+		if _, err := validateSFTPRemotePath(value); err == nil {
+			t.Errorf("expected %q to be rejected", value)
+		}
+	}
+}
+
+func TestSFTPProbePathRejectsTraversalPrefix(t *testing.T) {
+	if _, err := sftpProbePath("../../outside"); err == nil {
+		t.Fatal("expected traversal prefix to fail")
+	}
+}

internal/infrastructure/tray/tray.go

@@ -33,10 +33,10 @@ func Start(cbs Callbacks) (start, stop func()) {
 		systray.SetTemplateIcon(templateIconBytes, regularIconBytes)
 		systray.SetTooltip("SnapGo")
 
-		mCapture := systray.AddMenuItem("Capture screenshot", "Take a region screenshot")
-		mSettings := systray.AddMenuItem("Settings…", "Open settings window")
+		mCapture := systray.AddMenuItem("截图", "Take a region screenshot")
+		mSettings := systray.AddMenuItem("设置", "Open settings window")
 		systray.AddSeparator()
-		mQuit := systray.AddMenuItem("Quit SnapGo", "Quit the application")
+		mQuit := systray.AddMenuItem("退出", "Quit the application")
 
 		// Pump menu clicks on a dedicated goroutine. Channel sends from
 		// systray are non-blocking, so a slow user callback does not back

main.go

@@ -74,7 +74,7 @@ func main() {
 			WindowIsTranslucent:  true,
 			About: &mac.AboutInfo{
 				Title:   "SnapGo",
-				Message: "Cross-platform screenshot tool with one-click upload to S3.",
+				Message: "Cross-platform screenshot tool with one-click upload to S3, FTP, SFTP, or SSH.",
 			},
 		},
 	})

native_overlay_callbacks_darwin.go

@@ -74,6 +74,18 @@ func nativeOverlaySaveRemote(x, y, w, h C.int, annotationsJSON *C.char) {
 	}()
 }
 
+//export nativeOverlayUploadFTP
+func nativeOverlayUploadFTP(x, y, w, h C.int, annotationsJSON *C.char) {
+	app := consumeNativeOverlayApp()
+	if app == nil {
+		return
+	}
+	result := nativeCaptureResult(x, y, w, h, annotationsJSON)
+	go func() {
+		_ = app.UploadNativeRegionToFTP(result)
+	}()
+}
+
 //export nativeOverlaySummarize
 func nativeOverlaySummarize(x, y, w, h C.int, annotationsJSON *C.char) {
 	app := consumeNativeOverlayApp()
@@ -86,6 +98,18 @@ func nativeOverlaySummarize(x, y, w, h C.int, annotationsJSON *C.char) {
 	}()
 }
 
+//export nativeOverlayOCR
+func nativeOverlayOCR(x, y, w, h C.int, annotationsJSON *C.char) {
+	app := consumeNativeOverlayApp()
+	if app == nil {
+		return
+	}
+	result := nativeCaptureResult(x, y, w, h, annotationsJSON)
+	go func() {
+		_ = app.ExtractTextNativeRegion(result)
+	}()
+}
+
 //export nativeOverlayCancel
 func nativeOverlayCancel() {
 	app := consumeNativeOverlayApp()

promo/landing/.env.example

@@ -0,0 +1 @@
+VITE_BASE_PATH=/

promo/landing/.gitignore

@@ -0,0 +1,10 @@
+node_modules
+dist
+dist-ssr
+.vite
+.DS_Store
+*.log
+
+tsconfig.node.tsbuildinfo
+tsconfig.app.tsbuildinfo
+upload_koodo.py

promo/landing/index.html

@@ -0,0 +1,22 @@
+<!doctype html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/png" sizes="64x64" href="%BASE_URL%favicon.png" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta
+      name="description"
+      content="SnapGo — 截完图，链接已经在你剪贴板里。常驻菜单栏的轻量截图工具，一键上传到你自己的 S3 兼容对象存储。"
+    />
+    <meta property="og:title" content="SnapGo — 截完图，链接已经在剪贴板里" />
+    <meta
+      property="og:description"
+      content="常驻菜单栏的轻量截图工具，一键上传到你自己的 S3 兼容对象存储。"
+    />
+    <title>SnapGo — 截完图，链接已经在剪贴板里</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

promo/landing/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "snapgo-landing",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview",
+    "typecheck": "tsc -b --noEmit"
+  },
+  "dependencies": {
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.0.0",
+    "@types/react": "^18.3.12",
+    "@types/react-dom": "^18.3.1",
+    "@vitejs/plugin-react": "^4.3.4",
+    "tailwindcss": "^4.0.0",
+    "typescript": "^5.6.3",
+    "vite": "^5.4.11"
+  }
+}

promo/landing/src/App.tsx

@@ -0,0 +1,268 @@
+import { useMemo, useRef, useState, type AnimationEvent } from "react";
+import logoUrl from "./assets/logo-universal.png";
+import ShowcaseVisual from "./ShowcaseVisual";
+
+const slides = [
+  {
+    eyebrow: "UPLOAD",
+    title: "直达云端",
+    body: "截图可直接保存至对象存储、远端服务器等，并将地址直接复制到剪切板。",
+    metric: "OBS / SSH / FTP",
+    feature: "支持多种远端存储配置",
+  },
+  {
+    eyebrow: "IDENTIFICATION",
+    title: "智能识别",
+    body: "截图可按你配置进行 AI 识别与总结，直接将你所需要的答案复制到剪切板。",
+    metric: "AI",
+    feature: "支持自定义 prompt 与多 provider",
+  },
+  {
+    eyebrow: "OCR",
+    title: "文字提取",
+    body: "截图可自动识别其中的文本文字，并将文字直接复制到剪切板。",
+    metric: "TEXT",
+    feature: "兼容多个主流的 OCR 服务",
+  },
+  {
+    eyebrow: "CAPTURE",
+    title: "功能完备",
+    body: "完善的截图功能，支持各类标注、打码，直接复制与本机保存。",
+    metric: "⌘⇧S",
+    feature: "全局快捷键唤起",
+  },
+];
+
+type SlideDirection = -1 | 1;
+
+type SlideTransition = {
+  from: number;
+  direction: SlideDirection;
+};
+
+function Logo() {
+  return (
+    <div className="brand" aria-label="SnapGo logo">
+      <div className="brand-main">
+        <span className="logo-mark">
+          <img src={logoUrl} alt="SnapGo" />
+        </span>
+        <span className="brand-name">SnapGo</span>
+      </div>
+      <p className="brand-overline">AI SCREENSHOT UTILITY</p>
+    </div>
+  );
+}
+
+export default function App() {
+  const [activeSlide, setActiveSlide] = useState(0);
+  const [slideTransition, setSlideTransition] = useState<SlideTransition | null>(null);
+  const dragStartX = useRef<number | null>(null);
+  const active = slides[activeSlide];
+
+  function getTransitionClass(role: "entering" | "exiting") {
+    if (!slideTransition) {
+      return "";
+    }
+
+    const edge = slideTransition.direction === 1 ? "right" : "left";
+    return `is-${role}-from-${edge}`;
+  }
+
+  function finishSlideTransition(event: AnimationEvent<HTMLElement>) {
+    if (event.target === event.currentTarget) {
+      setSlideTransition(null);
+    }
+  }
+
+  function selectSlide(nextSlide: number, direction: SlideDirection) {
+    if (slideTransition || nextSlide === activeSlide) {
+      return;
+    }
+
+    setSlideTransition({ from: activeSlide, direction });
+    setActiveSlide(nextSlide);
+  }
+
+  function selectDotSlide(nextSlide: number) {
+    const forwardDistance = (nextSlide - activeSlide + slides.length) % slides.length;
+    const backwardDistance = (activeSlide - nextSlide + slides.length) % slides.length;
+    selectSlide(nextSlide, forwardDistance <= backwardDistance ? 1 : -1);
+  }
+
+  const accentDots = useMemo(
+    () =>
+      slides.map((slide, index) => (
+        <button
+          key={slide.eyebrow}
+          className={`dot ${index === activeSlide ? "is-active" : ""}`}
+          type="button"
+          aria-label={`查看 ${slide.title}`}
+          onClick={() => selectDotSlide(index)}
+        />
+      )),
+    [activeSlide, slideTransition],
+  );
+
+  function moveSlide(direction: SlideDirection) {
+    const nextSlide = (activeSlide + direction + slides.length) % slides.length;
+    selectSlide(nextSlide, direction);
+  }
+
+  function handlePointerEnd(clientX: number) {
+    if (dragStartX.current === null) {
+      return;
+    }
+
+    const delta = clientX - dragStartX.current;
+    dragStartX.current = null;
+    if (Math.abs(delta) < 42) {
+      return;
+    }
+
+    moveSlide(delta > 0 ? -1 : 1);
+  }
+
+  return (
+    <main className="landing-shell">
+      <div className="ambient ambient-one" aria-hidden="true" />
+      <div className="ambient ambient-two" aria-hidden="true" />
+      <Logo />
+
+      <section className="hero-copy" aria-labelledby="landing-title">
+        <h1 id="landing-title">AI 时代的截图工具</h1>
+        <p className="subtitle">高效、便捷、专为 AI 交互设计</p>
+        <p className="intro">
+          智能识图，发布链接，提取文本..
+          <br />
+          你能想到的都能一键解决
+        </p>
+
+        <div className="cta-row" aria-label="下载与项目链接">
+          <div className="download-cta-group">
+            <a className="primary-cta" href="https://gitea.mamamiyear.site/mamamiyear/SnapGo">
+              <span className="apple-logo" aria-hidden="true"></span>
+              下载 Mac 应用
+              <svg viewBox="0 0 20 20" aria-hidden="true">
+                <path d="M5 10h9M10.5 6.5 14 10l-3.5 3.5" />
+              </svg>
+            </a>
+            <span className="platform-note">Windows/Linux 版本紧锣密鼓开发中</span>
+          </div>
+          <a
+            className="github-cta"
+            href="https://gitea.mamamiyear.site/mamamiyear/SnapGo"
+            aria-label="查看源码"
+            title="查看源码"
+          >
+            <svg viewBox="0 0 24 24" aria-hidden="true">
+              <path
+                fillRule="evenodd"
+                clipRule="evenodd"
+                d="M12 2C6.48 2 2 6.58 2 12.23c0 4.52 2.87 8.35 6.84 9.7.5.09.68-.22.68-.49 0-.24-.01-.88-.01-1.73-2.78.62-3.37-1.37-3.37-1.37-.45-1.18-1.11-1.5-1.11-1.5-.91-.64.07-.63.07-.63 1 .07 1.53 1.06 1.53 1.06.9 1.57 2.34 1.12 2.91.86.09-.67.35-1.12.64-1.38-2.22-.26-4.56-1.14-4.56-5.06 0-1.12.39-2.03 1.03-2.74-.1-.26-.45-1.3.1-2.7 0 0 .84-.28 2.75 1.05A9.32 9.32 0 0 1 12 6.96c.85 0 1.7.12 2.5.34 1.91-1.33 2.75-1.05 2.75-1.05.55 1.4.2 2.44.1 2.7.64.71 1.03 1.62 1.03 2.74 0 3.93-2.34 4.8-4.57 5.05.36.32.68.94.68 1.9 0 1.38-.01 2.49-.01 2.83 0 .27.18.59.69.49A10.1 10.1 0 0 0 22 12.23C22 6.58 17.52 2 12 2Z"
+              />
+            </svg>
+          </a>
+        </div>
+      </section>
+
+      <section className="product-showcase" aria-label="SnapGo 功能效果展示">
+        <div
+          className="device-card"
+          onPointerDown={(event) => {
+            dragStartX.current = event.clientX;
+          }}
+          onPointerUp={(event) => handlePointerEnd(event.clientX)}
+          onPointerCancel={() => {
+            dragStartX.current = null;
+          }}
+          onPointerLeave={() => {
+            dragStartX.current = null;
+          }}
+        >
+          <div className="window-chrome" aria-hidden="true">
+            <span />
+            <span />
+            <span />
+          </div>
+
+          <div className="preview-stage">
+            {slideTransition && (
+              <div
+                key={`visual-${slideTransition.from}`}
+                className={`carousel-slide is-exiting ${getTransitionClass("exiting")}`}
+                aria-hidden="true"
+              >
+                <ShowcaseVisual activeIndex={slideTransition.from} />
+              </div>
+            )}
+            <div
+              key={`visual-${activeSlide}`}
+              className={`carousel-slide ${slideTransition ? `is-entering ${getTransitionClass("entering")}` : ""}`}
+              onAnimationEnd={finishSlideTransition}
+            >
+              <ShowcaseVisual activeIndex={activeSlide} />
+            </div>
+          </div>
+
+          <div className="slide-panel-viewport">
+            {slideTransition && (
+              <div
+                key={`copy-${slideTransition.from}`}
+                className={`slide-panel is-exiting ${getTransitionClass("exiting")}`}
+                aria-hidden="true"
+              >
+                <p>{slides[slideTransition.from].eyebrow}</p>
+                <h2>{slides[slideTransition.from].title}</h2>
+                <span>{slides[slideTransition.from].body}</span>
+              </div>
+            )}
+            <div
+              key={`copy-${activeSlide}`}
+              className={`slide-panel ${slideTransition ? `is-entering ${getTransitionClass("entering")}` : ""}`}
+            >
+              <p>{active.eyebrow}</p>
+              <h2>{active.title}</h2>
+              <span>{active.body}</span>
+            </div>
+          </div>
+        </div>
+
+        <div className="carousel-bar">
+          <button type="button" className="nav-btn" aria-label="上一项" onClick={() => moveSlide(-1)}>
+            <svg viewBox="0 0 20 20" aria-hidden="true">
+              <path d="m12 5-5 5 5 5" />
+            </svg>
+          </button>
+          <div className="slide-meta-viewport" aria-live="polite">
+            {slideTransition && (
+              <div
+                key={`meta-${slideTransition.from}`}
+                className={`slide-meta is-exiting ${getTransitionClass("exiting")}`}
+                aria-hidden="true"
+              >
+                <strong>{slides[slideTransition.from].metric}</strong>
+                <span>{slides[slideTransition.from].feature}</span>
+              </div>
+            )}
+            <div
+              key={`meta-${activeSlide}`}
+              className={`slide-meta ${slideTransition ? `is-entering ${getTransitionClass("entering")}` : ""}`}
+            >
+              <strong>{active.metric}</strong>
+              <span>{active.feature}</span>
+            </div>
+          </div>
+          <div className="dots" aria-label="轮播分页">
+            {accentDots}
+          </div>
+          <button type="button" className="nav-btn" aria-label="下一项" onClick={() => moveSlide(1)}>
+            <svg viewBox="0 0 20 20" aria-hidden="true">
+              <path d="m8 5 5 5-5 5" />
+            </svg>
+          </button>
+        </div>
+      </section>
+    </main>
+  );
+}

promo/landing/src/ShowcaseVisual.tsx

@@ -0,0 +1,435 @@
+import { useState, type PointerEvent } from "react";
+
+type ShowcaseVisualProps = {
+  activeIndex: number;
+};
+
+type CaptureTool = "rect" | "arrow" | "pen" | "mosaic";
+type OcrLanguage = "zh" | "en" | "auto";
+type UploadDestination = {
+  id: "obs" | "ssh" | "ftp";
+  label: string;
+  detail: string;
+};
+
+const destinations: UploadDestination[] = [
+  { id: "obs", label: "OBS", detail: "Bucket" },
+  { id: "ssh", label: "SSH", detail: "Server" },
+  { id: "ftp", label: "FTP", detail: "Remote" },
+];
+
+const uploadRoutes: Record<UploadDestination["id"], string> = {
+  obs: "M 50 30 C 59 30 61 17 71 17",
+  ssh: "M 50 30 C 58 30 63 30 71 30",
+  ftp: "M 50 30 C 59 30 61 43 71 43",
+};
+
+const ocrModes: Array<{
+  id: OcrLanguage;
+  label: string;
+  name: string;
+  lines: string[];
+  characters: number;
+  confidence: string;
+}> = [
+  {
+    id: "zh",
+    label: "中",
+    name: "中文",
+    lines: ["让每一次截图直接进入下一步。"],
+    characters: 15,
+    confidence: "99.5%",
+  },
+  {
+    id: "en",
+    label: "EN",
+    name: "English",
+    lines: ["Capture, understand, share."],
+    characters: 27,
+    confidence: "99.1%",
+  },
+  {
+    id: "auto",
+    label: "AUTO",
+    name: "中英混排",
+    lines: ["Capture, understand, share.", "让每一次截图直接进入下一步。"],
+    characters: 42,
+    confidence: "99.2%",
+  },
+];
+
+const aiModes = [
+  {
+    id: "vision",
+    label: "识图",
+    result: "检测到系统权限弹窗，截图权限尚未开启。",
+    score: "96%",
+  },
+  {
+    id: "summary",
+    label: "总结",
+    result: "当前页面包含 3 个设置项，建议先开启屏幕录制权限。",
+    score: "93%",
+  },
+  {
+    id: "question",
+    label: "问答",
+    result: "前往系统设置中的隐私与安全性即可完成授权。",
+    score: "98%",
+  },
+];
+
+const captureTools: Array<{ id: CaptureTool; label: string }> = [
+  { id: "rect", label: "矩形" },
+  { id: "arrow", label: "箭头" },
+  { id: "pen", label: "画笔" },
+  { id: "mosaic", label: "马赛克" },
+];
+
+function stopSceneDrag(event: PointerEvent<HTMLElement>) {
+  event.stopPropagation();
+}
+
+function UploadScene() {
+  const [selected, setSelected] = useState<UploadDestination>(destinations[0]);
+  const routePath = uploadRoutes[selected.id];
+
+  return (
+    <div className={`visual-scene upload-scene target-${selected.id}`}>
+      <div className="upload-file-card">
+        <div className="upload-file-preview" aria-hidden="true">
+          <div className="screenshot-window-bar">
+            <span><i /><i /><i /></span>
+            <b className="screenshot-address-bar" />
+          </div>
+          <div className="screenshot-window-body">
+            <div className="screenshot-sidebar"><i /><i /><i /><i /></div>
+            <div className="screenshot-main">
+              <span className="screenshot-heading" />
+              <span className="screenshot-row row-long" />
+              <span className="screenshot-row row-medium" />
+              <div className="screenshot-card-grid">
+                <i /><i /><i />
+              </div>
+              <div className="screenshot-copy-lines">
+                <i /><i /><i />
+              </div>
+            </div>
+          </div>
+          <div className="upload-capture-frame">
+            <i className="upload-capture-corner corner-nw" />
+            <i className="upload-capture-corner corner-ne" />
+            <i className="upload-capture-corner corner-sw" />
+            <i className="upload-capture-corner corner-se" />
+          </div>
+        </div>
+        <div className="upload-file-copy">
+          <span>SCREENSHOT-1428.PNG</span>
+        </div>
+      </div>
+
+      <svg
+        className="upload-route"
+        viewBox="0 0 100 60"
+        preserveAspectRatio="none"
+        aria-hidden="true"
+      >
+        <path
+          key={`route-${selected.id}`}
+          className="upload-route-line"
+          d={routePath}
+          vectorEffect="non-scaling-stroke"
+        />
+        <path
+          key={`shimmer-${selected.id}`}
+          className="upload-route-shimmer"
+          d={routePath}
+          pathLength="100"
+          strokeDasharray="16 84"
+          vectorEffect="non-scaling-stroke"
+        />
+      </svg>
+
+      <span key={`packet-${selected.id}`} className={`upload-packet packet-${selected.id}`} aria-hidden="true">
+        <svg viewBox="0 0 20 20">
+          <path d="M 5 10 H 14 M 10.5 6.5 L 14 10 L 10.5 13.5" />
+        </svg>
+      </span>
+
+      <div className="upload-destinations" role="group" aria-label="上传目标">
+        {destinations.map((destination) => (
+          <button
+            key={destination.id}
+            type="button"
+            className={destination.id === selected.id ? "is-selected" : ""}
+            aria-pressed={destination.id === selected.id}
+            aria-label={`选择 ${destination.label} 上传目标`}
+            onPointerDown={stopSceneDrag}
+            onClick={() => setSelected(destination)}
+          >
+            <span className="destination-status" />
+            <strong>{destination.label}</strong>
+            <small>{destination.detail}</small>
+          </button>
+        ))}
+      </div>
+
+      <div className="upload-result scene-float-delayed" aria-live="polite">
+        <span className="result-check" aria-hidden="true">✓</span>
+        <div>
+          <small>LINK COPIED</small>
+          <strong>cdn.snapgo.dev/{selected.id}/...</strong>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+function IdentificationScene() {
+  const [mode, setMode] = useState(aiModes[0]);
+
+  return (
+    <div className="visual-scene identification-scene">
+      <div className="ai-source-card">
+        <div className="mini-window-bar" aria-hidden="true">
+          <span />
+          <span />
+          <span />
+        </div>
+        <div className="ai-source-content">
+          <span className="source-sidebar" />
+          <div className="source-settings">
+            <i />
+            <i />
+            <i />
+          </div>
+          <div className="source-dialog">
+            <span className="dialog-icon">!</span>
+            <div>
+              <strong>Permission required</strong>
+              <small>Screen Recording</small>
+            </div>
+          </div>
+        </div>
+        <span className="ai-scan-line" aria-hidden="true" />
+      </div>
+
+      <div className="ai-core" aria-hidden="true">
+        <span>AI</span>
+        <i className="ai-orbit orbit-one" />
+        <i className="ai-orbit orbit-two" />
+      </div>
+
+      <div className="ai-result-card scene-float-soft" aria-live="polite">
+        <div className="ai-result-heading">
+          <span className="ai-spark" aria-hidden="true">✦</span>
+          <strong>SnapGo Vision</strong>
+          <i />
+        </div>
+        <p>{mode.result}</p>
+        <div className="confidence-row">
+          <span><i /></span>
+          <small>{mode.score} confidence</small>
+        </div>
+      </div>
+
+      <div className="ai-mode-switch" role="group" aria-label="AI 处理模式">
+        {aiModes.map((item) => (
+          <button
+            key={item.id}
+            type="button"
+            className={item.id === mode.id ? "is-selected" : ""}
+            aria-pressed={item.id === mode.id}
+            onPointerDown={stopSceneDrag}
+            onClick={() => setMode(item)}
+          >
+            {item.label}
+          </button>
+        ))}
+      </div>
+    </div>
+  );
+}
+
+function OcrScene() {
+  const [copied, setCopied] = useState(false);
+  const [language, setLanguage] = useState<OcrLanguage>("auto");
+  const activeMode = ocrModes.find((mode) => mode.id === language) ?? ocrModes[2];
+
+  function selectLanguage(mode: OcrLanguage) {
+    setLanguage(mode);
+    setCopied(false);
+  }
+
+  return (
+    <div className="visual-scene ocr-scene">
+      <div className="ocr-document">
+        <div className="document-header">
+          <span />
+          <div><i /><i /><i /></div>
+        </div>
+        <div className="document-copy">
+          <strong>Release notes</strong>
+          <span className="text-line line-long" />
+          <span className="text-line line-medium" />
+          <span className="text-line line-highlight"><i>Capture, understand, share.</i></span>
+          <span className="text-line line-long" />
+          <span className="text-line line-short" />
+          <span className="text-line line-highlight secondary"><i>让每一次截图直接进入下一步。</i></span>
+        </div>
+        <span className="ocr-scan-bar" aria-hidden="true" />
+      </div>
+
+      <div className="ocr-selection-card scene-float-delayed">
+        <div className="selection-heading">
+          <span>OCR</span>
+          <small>{activeMode.name}</small>
+        </div>
+        <p>
+          {activeMode.lines.map((line) => <span key={line}>{line}</span>)}
+        </p>
+        <div className="selection-meta">
+          <span>{activeMode.characters} characters</span>
+          <strong>{activeMode.confidence}</strong>
+        </div>
+        <button
+          type="button"
+          className={copied ? "is-copied" : ""}
+          aria-pressed={copied}
+          onPointerDown={stopSceneDrag}
+          onClick={() => setCopied((current) => !current)}
+        >
+          <span aria-hidden="true">{copied ? "✓" : "⌘C"}</span>
+          {copied ? "已复制" : "复制文本"}
+        </button>
+      </div>
+
+      <div className="ocr-language-pills" role="group" aria-label="OCR 识别语言">
+        {ocrModes.map((mode) => (
+          <button
+            key={mode.id}
+            type="button"
+            className={mode.id === language ? "is-selected" : ""}
+            aria-pressed={mode.id === language}
+            onPointerDown={stopSceneDrag}
+            onClick={() => selectLanguage(mode.id)}
+          >
+            {mode.label}
+          </button>
+        ))}
+      </div>
+    </div>
+  );
+}
+
+function ToolGlyph({ tool }: { tool: CaptureTool }) {
+  if (tool === "rect") {
+    return <svg viewBox="0 0 20 20" aria-hidden="true"><rect x="4" y="4" width="12" height="12" rx="2" /></svg>;
+  }
+
+  if (tool === "arrow") {
+    return <svg viewBox="0 0 20 20" aria-hidden="true"><path d="M4 15 15 4M9 4h6v6" /></svg>;
+  }
+
+  if (tool === "pen") {
+    return <svg viewBox="0 0 20 20" aria-hidden="true"><path d="m5 15 2.2-4.7L13.8 3.7l2.5 2.5-6.6 6.6L5 15Z" /><path d="m11.8 5.7 2.5 2.5" /></svg>;
+  }
+
+  return (
+    <svg viewBox="0 0 20 20" aria-hidden="true">
+      <rect x="3" y="3" width="5" height="5" />
+      <rect x="12" y="3" width="5" height="5" />
+      <rect x="3" y="12" width="5" height="5" />
+      <rect x="12" y="12" width="5" height="5" />
+    </svg>
+  );
+}
+
+function AnnotationPreview({ tool }: { tool: CaptureTool }) {
+  if (tool === "arrow") {
+    return (
+      <svg className="annotation-arrow" viewBox="0 0 180 110" aria-hidden="true">
+        <path d="M28 84C66 78 91 56 139 31" />
+        <path d="m121 27 20 3-8 18" />
+      </svg>
+    );
+  }
+
+  if (tool === "pen") {
+    return (
+      <svg className="annotation-pen" viewBox="0 0 180 110" aria-hidden="true">
+        <path d="M24 76c20-42 36 25 57-6s33-33 48-4c9 18 21 13 29-7" />
+      </svg>
+    );
+  }
+
+  if (tool === "mosaic") {
+    return <div className="annotation-mosaic" aria-hidden="true">{Array.from({ length: 20 }, (_, index) => <span key={index} />)}</div>;
+  }
+
+  return <div className="annotation-rect" aria-hidden="true"><span /><span /><span /><span /></div>;
+}
+
+function CaptureScene() {
+  const [tool, setTool] = useState<CaptureTool>("rect");
+
+  return (
+    <div className="visual-scene capture-scene">
+      <div className="capture-canvas">
+        <div className="canvas-app-bar">
+          <span />
+          <strong>Project overview</strong>
+          <i />
+        </div>
+        <div className="canvas-layout" aria-hidden="true">
+          <span className="canvas-sidebar" />
+          <div className="canvas-content">
+            <i className="canvas-heading" />
+            <i className="canvas-line" />
+            <i className="canvas-line short" />
+            <div className="canvas-chart"><span /><span /><span /><span /><span /></div>
+          </div>
+        </div>
+        <div className="capture-selection">
+          <span className="selection-size">1280 × 720</span>
+          <i className="selection-handle handle-nw" />
+          <i className="selection-handle handle-ne" />
+          <i className="selection-handle handle-sw" />
+          <i className="selection-handle handle-se" />
+          <AnnotationPreview tool={tool} />
+        </div>
+      </div>
+
+      <div className="capture-toolbar" role="toolbar" aria-label="截图标注工具">
+        {captureTools.map((item) => (
+          <button
+            key={item.id}
+            type="button"
+            className={item.id === tool ? "is-selected" : ""}
+            aria-label={item.label}
+            aria-pressed={item.id === tool}
+            title={item.label}
+            onPointerDown={stopSceneDrag}
+            onClick={() => setTool(item.id)}
+          >
+            <ToolGlyph tool={item.id} />
+          </button>
+        ))}
+        <span className="toolbar-divider" />
+        <span className="toolbar-color" aria-hidden="true" />
+      </div>
+    </div>
+  );
+}
+
+const scenes = [UploadScene, IdentificationScene, OcrScene, CaptureScene];
+
+export default function ShowcaseVisual({ activeIndex }: ShowcaseVisualProps) {
+  const Scene = scenes[activeIndex] ?? UploadScene;
+
+  return (
+    <div className="scene-parallax" data-testid="showcase-visual">
+      <Scene />
+    </div>
+  );
+}

promo/landing/src/main.tsx

@@ -0,0 +1,10 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App";
+import "./index.css";
+
+ReactDOM.createRoot(document.getElementById("root")!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+);

promo/landing/src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />

promo/landing/tsconfig.app.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "useDefineForClassFields": true,
+    "allowImportingTsExtensions": false,
+    "noEmit": true
+  },
+  "include": ["src"]
+}

promo/landing/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}

promo/landing/tsconfig.node.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "isolatedModules": true,
+    "noEmit": true
+  },
+  "include": ["vite.config.ts"]
+}

promo/landing/vite.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig, loadEnv } from "vite";
+import react from "@vitejs/plugin-react";
+import tailwindcss from "@tailwindcss/vite";
+
+// https://vitejs.dev/config/
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, ".", "");
+
+  return {
+    base: env.VITE_BASE_PATH || "/",
+    plugins: [react(), tailwindcss()],
+    server: {
+      port: 5273,
+      open: true,
+    },
+  };
+});

scripts/dev-build.sh

@@ -43,6 +43,9 @@ sleep 0.4
 #    --identity flag in v2.
 ARCH="${ARCH:-arm64}"
 echo "[dev-build.sh] building darwin/${ARCH}..."
+# Allow the -Wl,-no_warn_duplicate_libraries flag declared in the darwin cgo
+# files past Go's cgo LDFLAGS allowlist (see activation_policy_darwin.go).
+export CGO_LDFLAGS_ALLOW='-Wl,-no_warn_duplicate_libraries'
 wails build -platform "darwin/${ARCH}" -clean
 
 # 5. Re-sign with the stable dev cert. We invoke sign.sh through env var

scripts/release.sh

@@ -35,7 +35,9 @@ echo "================================================================"
 # ---- 1. Build ----
 echo ""
 echo "[release.sh] (1/4) wails build"
-( cd "${ROOT_DIR}" && wails build -platform "${WAILS_PLATFORM}" -clean )
+# Allow the -Wl,-no_warn_duplicate_libraries flag declared in the darwin cgo
+# files past Go's cgo LDFLAGS allowlist (see activation_policy_darwin.go).
+( cd "${ROOT_DIR}" && CGO_LDFLAGS_ALLOW='-Wl,-no_warn_duplicate_libraries' wails build -platform "${WAILS_PLATFORM}" -clean )
 
 # ---- 2. Sign .app ----
 echo ""