前端：

1、优化消息排序逻辑
2、新增加载历史消息
3、修复已知问题
后端：
1、优化消息排序逻辑
2、增加用户信息缓存机制
3、修改日期类型为DateTimeOffset改善时区信息丢失问题
3、修复了已知问题
数据库：
1、新增SequenceId字段用于消息排序
2、新增ClientMsgId字段用于客户端消息回执

backend/IM_API/Interface/Services/IMessageSevice.cs

@@ -1,4 +1,7 @@
 using IM_API.Dtos;
+using IM_API.Dtos.Message;
+using IM_API.Models;
+using IM_API.VOs.Message;
 
 namespace IM_API.Interface.Services
 {
@@ -11,7 +14,7 @@ namespace IM_API.Interface.Services
         /// <param name="receiverId">接收人</param>
         /// <param name="dto"></param>
         /// <returns></returns>
-        Task<MessageBaseDto> SendPrivateMessageAsync(int senderId,int receiverId,MessageBaseDto dto);
+        Task<MessageBaseVo> SendPrivateMessageAsync(int senderId,int receiverId,MessageBaseDto dto);
         /// <summary>
         /// 发送群聊消息
         /// </summary>
@@ -19,16 +22,21 @@ namespace IM_API.Interface.Services
         /// <param name="groupId">接收群id</param>
         /// <param name="dto"></param>
         /// <returns></returns>
-        Task<MessageBaseDto> SendGroupMessageAsync(int senderId,int groupId,MessageBaseDto dto);
+        Task<MessageBaseVo> SendGroupMessageAsync(int senderId,int groupId,MessageBaseDto dto);
         /// <summary>
-        /// 获取消息列表
+        /// 消息入库
+        /// </summary>
+        /// <param name="message"></param>
+        /// <returns></returns>
+        Task MakeMessageAsync(Message message);
+        /// <summary>
+        /// 获取历史消息列表
         /// </summary>
         /// <param name="conversationId">会话id（用于获取指定用户间聊天消息）</param>
-        /// <param name="msgId">消息id</param>
+        /// <param name="sequenceId">消息id</param>
         /// <param name="pageSize">获取消息数量</param>
-        /// <param name="desc"></param>
         /// <returns></returns>
-        Task<List<MessageBaseDto>> GetMessagesAsync(int userId, int conversationId,int? msgId,int? pageSize,bool desc);
+        Task<List<MessageBaseVo>> GetMessagesAsync(int userId,MessageQueryDto dto);
         /// <summary>
         /// 获取未读消息数
         /// </summary>