chore: add documentation comments and stylecop rules

src/Api/TakeoutSaaS.AdminApi/Controllers/UserPermissionsController.cs

@@ -58,6 +58,7 @@ public sealed class UserPermissionsController(IAdminAuthService authService) : B
         [FromQuery] SearchUserPermissionsQuery query,
         CancellationToken cancellationToken)
     {
+        // 1. 查询当前租户的用户权限概览
         var result = await authService.SearchUserPermissionsAsync(
             query.Keyword,
             query.Page,
@@ -66,6 +67,7 @@ public sealed class UserPermissionsController(IAdminAuthService authService) : B
             query.SortDescending,
             cancellationToken);
 
+        // 2. 返回分页结果
         return ApiResponse<PagedResult<UserPermissionDto>>.Ok(result);
     }
 }