feat(security): add distributed authorization foundation

Tiku.Api/Controllers/MeController.cs

@@ -15,6 +15,8 @@ public sealed class MeController(
     TikuDbContext dbContext) : ControllerBase
 {
     [HttpGet]
+    [EndpointSummary("获取当前登录用户")]
+    [EndpointDescription("根据 Bearer Token 返回当前用户基础信息和活跃租户成员摘要。")]
     public async Task<ActionResult<MeResponse>> Get(CancellationToken cancellationToken)
     {
         if (currentUser.UserId is null)