feat(app): implement basic function

General
- 配置界面支持配置对象存储桶
- 快捷键进入截图
- 一键上传截图 & 复制截图链接

MacOS
- 状态栏指示器和应用图标

main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"context"
+	"embed"
+
+	"github.com/wailsapp/wails/v2"
+	"github.com/wailsapp/wails/v2/pkg/options"
+	"github.com/wailsapp/wails/v2/pkg/options/assetserver"
+	"github.com/wailsapp/wails/v2/pkg/options/mac"
+
+	"github.com/mmmy/snapgo/internal/infrastructure/tray"
+)
+
+//go:embed all:frontend/dist
+var assets embed.FS
+
+func main() {
+	app := NewApp()
+
+	// Wire up the menu-bar agent. Start() returns a `start` thunk that we
+	// invoke from OnStartup so the icon appears AFTER Wails has spun up the
+	// Cocoa runloop, and a `stop` thunk we call on shutdown.
+	startTray, stopTray := tray.Start(tray.Callbacks{
+		OnCapture:  func() { app.CaptureNow() },
+		OnSettings: func() { app.ShowWindow() },
+		OnQuit:     func() { app.QuitApp() },
+	})
+
+	err := wails.Run(&options.App{
+		Title:     "SnapGo",
+		Width:     900,
+		Height:    640,
+		MinWidth:  720,
+		MinHeight: 520,
+		AssetServer: &assetserver.Options{
+			Assets: assets,
+		},
+		// Keep the standard macOS title bar for the Settings window. The
+		// capture UI uses a separate native NSPanel on macOS, so the main
+		// Wails window no longer needs to be frameless.
+		Frameless:         false,
+		StartHidden:       true,
+		HideWindowOnClose: true,
+		BackgroundColour:  &options.RGBA{R: 0, G: 0, B: 0, A: 0},
+		OnStartup: func(ctx context.Context) {
+			app.startup(ctx)
+			installActivationPolicyHooks()
+			hideDockIcon()
+			startTray()
+		},
+		OnBeforeClose: func(ctx context.Context) (prevent bool) {
+			hideDockIcon()
+			return false
+		},
+		OnShutdown: func(ctx context.Context) {
+			stopTray()
+			app.shutdown(ctx)
+		},
+		Bind: []interface{}{
+			app,
+		},
+		Mac: &mac.Options{
+			// The capture overlay is native AppKit on macOS; the Wails
+			// Settings window should behave like a normal macOS window.
+			WebviewIsTransparent: true,
+			WindowIsTranslucent:  true,
+			About: &mac.AboutInfo{
+				Title:   "SnapGo",
+				Message: "Cross-platform screenshot tool with one-click upload to S3.",
+			},
+		},
+	})
+
+	if err != nil {
+		println("Error:", err.Error())
+	}
+
+	// Defensive: ensure the tray is torn down even if Wails exited via an
+	// error path that bypassed OnShutdown.
+	stopTray()
+}