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

native_overlay_other.go

@@ -0,0 +1,11 @@
+//go:build !darwin
+
+package main
+
+import "github.com/mmmy/snapgo/internal/infrastructure/display"
+
+// showNativeCaptureOverlay is only implemented on macOS. Other platforms
+// keep using the Wails WebView overlay fallback.
+func showNativeCaptureOverlay(_ *App, _ display.Info) bool {
+	return false
+}