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_callbacks_darwin.go

@@ -0,0 +1,36 @@
+//go:build darwin
+
+package main
+
+import "C"
+
+//export nativeOverlayConfirm
+func nativeOverlayConfirm(x, y, w, h C.int) {
+	nativeOverlayState.Lock()
+	app := nativeOverlayState.app
+	nativeOverlayState.app = nil
+	nativeOverlayState.Unlock()
+	if app == nil {
+		return
+	}
+	go func() {
+		_ = app.ConfirmNativeRegion(RegionRect{
+			X: int(x),
+			Y: int(y),
+			W: int(w),
+			H: int(h),
+		})
+	}()
+}
+
+//export nativeOverlayCancel
+func nativeOverlayCancel() {
+	nativeOverlayState.Lock()
+	app := nativeOverlayState.app
+	nativeOverlayState.app = nil
+	nativeOverlayState.Unlock()
+	if app == nil {
+		return
+	}
+	go app.CancelNativeRegion()
+}