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>

src/locales/en_US/pages.ts

@@ -329,6 +329,8 @@ export default {
   'form.role.placeholder2': 'System roles cannot modify permission levels',
   'form.role.badgeColor': 'Badge Color',
   'form.role.menuIds': 'Bound Permissions (Menus)',
+  'form.role.permissionGuide': 'Permission Guide',
+  'form.role.otherPermissions': 'Other Menu Permissions',
 
   'form.config.timezone': 'Timezone Settings',
   'form.config.timezone.title': 'Default Timezone',