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/cursor/cursor_other.go

@@ -0,0 +1,9 @@
+//go:build !darwin
+
+package cursor
+
+// Get is a no-op stub on non-macOS targets. The toolbar will fall back to
+// the centre of the screen on these platforms.
+func Get() (Point, error) {
+	return Point{X: 0, Y: 0}, nil
+}