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.go

@@ -0,0 +1,12 @@
+// Package cursor exposes the current mouse pointer position in a
+// platform-agnostic way. We use it to anchor the post-capture toolbar near
+// the location where the user released the mouse — on macOS that point is
+// effectively the bottom-right corner of the screencapture selection.
+package cursor
+
+// Point is a screen-space pointer location, in *logical* pixels (i.e. the
+// coordinate system Wails uses for window placement).
+type Point struct {
+	X int
+	Y int
+}