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/hotkey/hotkey_other.go

@@ -0,0 +1,11 @@
+//go:build !darwin
+
+package hotkey
+
+import hk "golang.design/x/hotkey"
+
+// On Windows / Linux we map "cmd" to Ctrl so the same config string works
+// across platforms; "option" is treated as Alt.
+func modCmd() hk.Modifier    { return hk.ModCtrl }
+func modCtrl() hk.Modifier   { return hk.ModCtrl }
+func modOption() hk.Modifier { return hk.ModAlt }