docs: 完善参数注释与StyleCop配置

src/Domain/TakeoutSaaS.Domain/Tenants/Repositories/ITenantAnnouncementReadRepository.cs

@@ -1,6 +1,3 @@
-using System.Collections.Generic;
-using System.Threading;
-using System.Threading.Tasks;
 using TakeoutSaaS.Domain.Tenants.Entities;
 
 namespace TakeoutSaaS.Domain.Tenants.Repositories;
@@ -44,11 +41,13 @@ public interface ITenantAnnouncementReadRepository
     /// </summary>
     /// <param name="record">已读实体。</param>
     /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>异步任务。</returns>
     Task AddAsync(TenantAnnouncementRead record, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// 保存变更。
     /// </summary>
     /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>异步任务。</returns>
     Task SaveChangesAsync(CancellationToken cancellationToken = default);
 }