feat: add permission-based access control and improve alert table UI

- Implement PermissionGuard component for route-level permission enforcement
- Add tree-based permission checkbox group in role management popup
- Gate SSE connection, unread count fetch, and rule edit actions on user permissions
- Add skip401Refresh option and auto token refresh on 401 response
- Improve alert table with fixed columns, explicit widths, and text ellipsis
- Add i18n entries for permission guide and rule menu descriptions (en/zh)
- Add expo-api nginx proxy configuration
- Add .claude to .gitignore

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

config/config.ts

@@ -91,7 +91,9 @@ const config: ConfigType = defineConfig({
    * @description Can be used to store global data such as user info or global state. The global initial state is created at the very start of the Umi project.
    * @doc https://umijs.org/docs/max/data-flow#%E5%85%A8%E5%B1%80%E5%88%9D%E5%A7%8B%E7%8A%B6%E6%80%81
    */
-  initialState: {},
+  initialState: {
+    loading: '@/loading',
+  },
   /**
    * @name layout 插件
    * @doc https://umijs.org/docs/max/layout-menu