feat(task-processor): implement PictureTaskProcessor for background image processing tasks

Models/DataBase/BackgroundTask.cs

@@ -0,0 +1,62 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Foxel.Models.DataBase
+{
+    public enum TaskType
+    {
+        PictureProcessing = 0,
+    }
+
+    public enum TaskExecutionStatus
+    {
+        Pending,    // 等待处理
+        Processing, // 处理中
+        Completed,  // 处理完成
+        Failed      // 处理失败
+    }
+
+    public class BackgroundTask
+    {
+        [Key]
+        public Guid Id { get; set; } // 任务的唯一标识符
+
+        public TaskType Type { get; set; } // 任务类型
+
+        public TaskExecutionStatus Status { get; set; } // 当前状态
+
+        public int Progress { get; set; } // 进度 (0-100)
+
+        [Column(TypeName = "jsonb")]
+        public string? Payload { get; set; } // JSON 字符串，存储任务特定数据
+
+        public string? ErrorMessage { get; set; } // 错误信息（如果任务失败）
+
+        public DateTime CreatedAt { get; set; } // 创建时间
+
+        public DateTime? StartedAt { get; set; } // 开始处理时间
+
+        public DateTime? CompletedAt { get; set; } // 完成时间
+
+        public int? UserId { get; set; } // 关联的用户ID
+        public User? User { get; set; }
+
+        public int? RelatedEntityId { get; set; } 
+
+        public BackgroundTask()
+        {
+            Id = Guid.NewGuid();
+            CreatedAt = DateTime.UtcNow;
+            Status = TaskExecutionStatus.Pending;
+            Progress = 0;
+        }
+    }
+
+    public class PictureProcessingPayload
+    {
+        public int PictureId { get; set; }
+        public required string OriginalFilePath { get; set; }
+        public int? UserIdForPicture { get; set; }
+    }
+}

Models/DataBase/Picture.cs

@@ -41,10 +41,6 @@ public class Picture : BaseModel
 
     public bool ContentWarning { get; set; } = false;
     public PermissionType Permission { get; set; } = PermissionType.Public;
-
-    public ProcessingStatus ProcessingStatus { get; set; } = ProcessingStatus.Pending;
-    public string? ProcessingError { get; set; }
-    public int ProcessingProgress { get; set; } = 0;
 }
 
 public enum PermissionType
@@ -53,11 +49,3 @@ public enum PermissionType
     Friends = 1,
     Private = 2
 }
-
-public enum ProcessingStatus
-{
-    Pending, // 等待处理
-    Processing, // 处理中
-    Completed, // 处理完成
-    Failed // 处理失败
-}