完成离线消息发送和上线获取离线消息

Entity/Chat/Component/ChatUnitManageComponent.cs

@@ -1,8 +1,17 @@
-using Fantasy.Entitas;
+using Fantasy;
+using Fantasy.DataStructure.Collection;
+using Fantasy.Entitas;
 
 namespace NB.Chat;
 
 public class ChatUnitManageComponent : Entity
 {
     public readonly Dictionary<long, ChatUnit> ChatUnits = new();
+
+    /// <summary>
+    /// 不在线消息缓存
+    /// </summary>
+    public readonly OneToManyList<long, ChatMessageInfo> NotSendMessage = new();
+
+    public readonly OneToManyList<string, ChatMessageInfo> PrivateMessage = new();
 }