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

internal/infrastructure/tray/dispatch_other.go

@@ -0,0 +1,16 @@
+//go:build !darwin
+
+package tray
+
+// dispatchOnMain is a no-op on non-darwin platforms because:
+//   - On Linux (GTK/AppIndicator), systray.Run / nativeStart can be invoked
+//     from any goroutine; the GTK runloop is started internally.
+//   - On Windows, status icons are tied to a hidden window owned by the
+//     systray library itself, also independent of the Go main goroutine.
+// Wrapping the call in dispatchOnMain on these platforms would just add a
+// pointless layer of indirection.
+func dispatchOnMain(fn func()) {
+	if fn != nil {
+		fn()
+	}
+}