feat: admin simple 登录支持 账号@手机号

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

@@ -60,6 +60,14 @@ public interface ITenantRepository
     /// <returns>存在返回 true，否则 false。</returns>
     Task<bool> ExistsByContactPhoneAsync(string phone, CancellationToken cancellationToken = default);
 
+    /// <summary>
+    /// 依据联系人手机号查询租户 ID。
+    /// </summary>
+    /// <param name="phone">联系人手机号。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>租户 ID，未找到返回 null。</returns>
+    Task<long?> FindTenantIdByContactPhoneAsync(string phone, CancellationToken cancellationToken = default);
+
     /// <summary>
     /// 获取实名资料。
     /// </summary>