前端：

优化electron效果

backend/IM_API/VOs/Group/GroupMemberVo.cs

@@ -0,0 +1,14 @@
+using IM_API.Models;
+
+namespace IM_API.VOs.Group
+{
+    public class GroupMemberVo
+    {
+        public int UserId { get; set; }
+        public string Username { get; set; }
+        public string Nickname { get; set; }
+        public string Avatar { get; set; }
+        public GroupMemberRole Role { get; set; }
+        public DateTimeOffset Created { get; set; }
+    }
+}