后端：

完善注册页面

backend/IM_API/Interface/Services/IGroupService.cs

@@ -56,5 +56,12 @@ namespace IM_API.Interface.Services
         Task<GroupInfoVo> UpdateGroupInfoAsync(int userId, int groupId, GroupUpdateDto updateDto);
 
         Task<GroupInfoVo> GetGroupInfoAsync(int groupId);
+
+        /// <summary>
+        /// 获取群聊通知
+        /// </summary>
+        /// <param name="userId"></param>
+        /// <returns></returns>
+        Task<List<GroupNotificationVo>> GetGroupNotificationAsync(int userId);
     }
 }