add(conversation):完善私聊好友会话服务

backend/IM_API/Models/Conversation.cs

@@ -18,27 +18,33 @@ public partial class Conversation
     public int TargetId { get; set; }
 
     /// <summary>
-    /// 消息类型（同Messages.MsgType）	
+    /// 最后一条未读消息ID	
     /// </summary>
-    public int MsgType { get; set; }
-
-    /// <summary>
-    /// 最后一条消息ID	
-    /// </summary>
-    public int LastMessageId { get; set; }
+    public int? LastReadMessageId { get; set; }
 
     /// <summary>
     /// 未读消息数	
     /// </summary>
     public int UnreadCount { get; set; }
 
-    public string TargetName { get; set; } = null!;
-
-    public string? TargetAvatar { get; set; }
-
     public int ChatType { get; set; }
 
-    public virtual Message LastMessage { get; set; } = null!;
+    /// <summary>
+    /// 消息推送唯一标识符
+    /// </summary>
+    public string StreamKey { get; set; } = null!;
+
+    /// <summary>
+    /// 最后一条最新消息
+    /// </summary>
+    public string LastMessage { get; set; } = null!;
+
+    /// <summary>
+    /// 最后一条消息发送时间
+    /// </summary>
+    public DateTime LastMessageTime { get; set; }
+
+    public virtual Message? LastReadMessage { get; set; }
 
     public virtual User User { get; set; } = null!;
 }