后端：

完善注册页面

backend/IM_API/Models/User.cs

@@ -23,6 +23,18 @@ public partial class User
     /// 用户昵称
     /// </summary>
     public string? NickName { get; set; }
+    /// <summary>
+    /// 用户邮箱
+    /// </summary>
+    public string? Email { get; set; }
+    /// <summary>
+    /// 用户签名
+    /// </summary>
+    public string? Description { get; set; } = "";
+    /// <summary>
+    /// 地区
+    /// </summary>
+    public string? Region { get; set; } = "未知地区";
 
     /// <summary>
     /// 用户在线状态
@@ -73,10 +85,6 @@ public partial class User
     [JsonIgnore]
     public virtual ICollection<Friend> FriendUsers { get; set; } = new List<Friend>();
     [JsonIgnore]
-    public virtual ICollection<GroupInvite> GroupInviteInviteUserNavigations { get; set; } = new List<GroupInvite>();
-    [JsonIgnore]
-    public virtual ICollection<GroupInvite> GroupInviteInvitedUserNavigations { get; set; } = new List<GroupInvite>();
-    [JsonIgnore]
     public virtual ICollection<GroupMember> GroupMembers { get; set; } = new List<GroupMember>();
     [JsonIgnore]
     public virtual ICollection<GroupRequest> GroupRequests { get; set; } = new List<GroupRequest>();