first commit

backend/F9WebAiTest.Domain/Entities/Notice/UserNotificationSubscription.cs

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Domain.Entities.Notice;
+
+/// <summary>用户订阅（用户主动订阅/取消，保留历史）</summary>
+[Table(Name = "UserNotificationSubscriptions")]
+[Index("IX_UserNotificationSubscriptions_UserId_NotificationTypeId", "UserId, NotificationTypeId", IsUnique = true)]
+public class UserNotificationSubscription : BaseEntity
+{
+    public long UserId { get; set; }               // 订阅用户ID
+    public long NotificationTypeId { get; set; }   // 消息类型ID
+    public bool IsActive { get; set; } = true;     // 订阅状态：true=已订阅 false=已取消
+    public DateTime SubscribedTime { get; set; } = DateTime.Now; // 订阅时间
+    public DateTime? CancelTime { get; set; }      // 取消订阅时间
+}