添加消息类型枚举和相关字段，优化消息记录服务的添加方法，更新多个组件以支持新增分类对话框

Entity/MessageRecord.cs

@@ -1,5 +1,24 @@
 namespace Entity;
 
+/// <summary>
+/// 消息类型
+/// </summary>
+public enum MessageType
+{
+    /// <summary>
+    /// 文本
+    /// </summary>
+    Text = 0,
+    /// <summary>
+    /// 跳转URL
+    /// </summary>
+    Url = 1,
+    /// <summary>
+    /// HTML内容
+    /// </summary>
+    Html = 2
+}
+
 /// <summary>
 /// 消息实体
 /// </summary>
@@ -15,6 +34,11 @@ public class MessageRecord : BaseEntity
     /// </summary>
     public string Content { get; set; } = string.Empty;
 
+    /// <summary>
+    /// 消息类型
+    /// </summary>
+    public MessageType MessageType { get; set; } = MessageType.Text;
+
     /// <summary>
     /// 是否已读
     /// </summary>