chore: migrate contexts to stores and refresh barrel exports

- Move state management from `src/contexts` to `src/stores` (zustand-based)
- Update barrelsby config to include new stores directory
- Add bottom-sheet and auth-background components
- Auto-open browser on dev server ready in VS Code launch config
- Refresh generated barrel index files

src/stores/auth/index.ts

@@ -1,13 +1,10 @@
 /**
- * @file Auth 公共导出
+ * Auth 状态机公共导出（barrel）
  *
- * 状态机重构后：
- *   - Context 形状与初始值位于 auth-context.ts
- *   - 事件联合位于 auth-events.ts
- *   - machine / 类型 / React 入口分别由对应文件导出
+ * 重新导出 Auth store 的所有公共 API（state / events / machine / React Provider）。
  */
+
 export * from "./auth-state";
 export * from "./auth-context";
 export * from "./auth-events";
 export * from "./auth-machine";
-export * from "./auth-types";