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/Controllers/AuthController.cs

@@ -4,6 +4,7 @@ using IM_API.Dtos.Auth;
 using IM_API.Dtos.User;
 using IM_API.Interface.Services;
 using IM_API.Tools;
+using IM_API.VOs.Auth;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.AspNetCore.Mvc;
@@ -44,7 +45,7 @@ namespace IM_API.Controllers
             (string token,DateTime expiresAt) = _jwtService.CreateAccessTokenForUser(user.Id,user.Username,"user");
             //生成刷新凭证
             string refreshToken = await _refreshTokenService.CreateRefreshTokenAsync(user.Id);
-            var res = new BaseResponse<LoginDto>(new LoginDto(userInfo,token,refreshToken, expiresAt));
+            var res = new BaseResponse<LoginVo>(new LoginVo(userInfo,token,refreshToken, expiresAt));
             return Ok(res);
         }
         [HttpPost]
@@ -55,18 +56,18 @@ namespace IM_API.Controllers
             return Ok(res);
         }
         [HttpPost]
-        [ProducesResponseType(typeof(BaseResponse<LoginDto>),StatusCodes.Status200OK)]
+        [ProducesResponseType(typeof(BaseResponse<LoginVo>),StatusCodes.Status200OK)]
         public async Task<IActionResult> Refresh(RefreshDto dto)
         {
             (bool ok,int userId) = await _refreshTokenService.ValidateRefreshTokenAsync(dto.refreshToken);
             if (!ok)
             {
-                var err = new BaseResponse<LoginDto>(CodeDefine.AUTH_FAILED);
+                var err = new BaseResponse<LoginVo>(CodeDefine.AUTH_FAILED);
                 return Unauthorized(err);
             }
             var userinfo = await _userService.GetUserInfoAsync(userId);
             (string token,DateTime expiresAt) = _jwtService.CreateAccessTokenForUser(userinfo.Id,userinfo.Username,"user");
-            var res = new BaseResponse<LoginDto>(new LoginDto(userinfo,token, dto.refreshToken, expiresAt));
+            var res = new BaseResponse<LoginVo>(new LoginVo(userinfo,token, dto.refreshToken, expiresAt));
             return Ok(res);
         }
     }