前端：

1、完善创建群聊逻辑
后端：
1、完善群聊相关接口

backend/IM_API/Controllers/GroupController.cs

@@ -32,12 +32,40 @@ namespace IM_API.Controllers
 
         [HttpPost]
         [ProducesResponseType(typeof(BaseResponse<GroupInfoDto>), StatusCodes.Status200OK)]
-        public async Task<ActionResult> CreateGroup([FromBody]GroupCreateDto groupCreateDto)
+        public async Task<IActionResult> CreateGroup([FromBody]GroupCreateDto groupCreateDto)
         {
             var userIdStr = User.FindFirstValue(ClaimTypes.NameIdentifier);
             var groupInfo = await _groupService.CreateGroupAsync(int.Parse(userIdStr), groupCreateDto);
             var res = new BaseResponse<GroupInfoDto>(groupInfo);
             return Ok(res);
         }
+
+        [HttpPost]
+        [ProducesResponseType(typeof(BaseResponse<object?>), StatusCodes.Status200OK)]
+        public async Task<IActionResult> HandleGroupInvite([FromBody]HandleGroupInviteDto dto)
+        {
+            string userIdStr = User.FindFirstValue(ClaimTypes.NameIdentifier)!;
+            await _groupService.HandleGroupInviteAsync(int.Parse(userIdStr), dto);
+            var res = new BaseResponse<object?>();
+            return Ok(res);
+        }
+        [HttpPost]
+        [ProducesResponseType(typeof(BaseResponse<object?>), StatusCodes.Status200OK)]
+        public async Task<IActionResult> HandleGroupRequest([FromBody]HandleGroupRequestDto dto)
+        {
+            string userIdStr = User.FindFirstValue(ClaimTypes.NameIdentifier);
+            await _groupService.HandleGroupRequestAsync(int.Parse(userIdStr),dto);
+            var res = new BaseResponse<object?>();
+            return Ok(res);
+        }
+        [HttpPost]
+        [ProducesResponseType(typeof(BaseResponse<object?>), StatusCodes.Status200OK)]
+        public async Task<IActionResult> InviteUser([FromBody]GroupInviteUserDto dto)
+        {
+            string userIdStr = User.FindFirstValue(ClaimTypes.NameIdentifier);
+            await _groupService.InviteUsersAsync(int.Parse(userIdStr), dto.GroupId, dto.Ids);
+            var res = new BaseResponse<object?>();
+            return Ok(res);
+        }
     }
 }