feat: 管理端返回权限过滤的菜单树

src/Application/TakeoutSaaS.Application/Identity/Services/AdminAuthService.cs

@@ -94,10 +94,25 @@ public sealed class AdminAuthService(
     {
         var user = await userRepository.FindByIdAsync(userId, cancellationToken)
                    ?? throw new BusinessException(ErrorCodes.NotFound, "用户不存在");
-
+        // 1. 返回档案
         return await BuildProfileAsync(user, cancellationToken);
     }
 
+    /// <summary>
+    /// 获取当前用户可见菜单树。
+    /// </summary>
+    /// <param name="userId">用户 ID。</param>
+    /// <param name="cancellationToken">取消令牌。</param>
+    /// <returns>菜单树。</returns>
+    public async Task<IReadOnlyList<MenuNodeDto>> GetMenuTreeAsync(long userId, CancellationToken cancellationToken = default)
+    {
+        // 1. 读取档案以获取权限
+        var profile = await GetProfileAsync(userId, cancellationToken);
+        // 2. 生成菜单树
+        var menu = AdminMenuProvider.BuildMenuTree(profile.Permissions);
+        return menu;
+    }
+
     /// <summary>
     /// 获取指定用户的权限概览（校验当前租户）。
     /// </summary>