feat: 完成代码逻辑错误修复和任务清理系统实现

主要更新:
- 修复了所有主要的代码逻辑错误
- 实现了完整的任务清理系统
- 添加了系统设置页面的任务清理管理功能
- 修复了API调用认证问题
- 优化了密码加密和验证机制
- 统一了错误处理模式
- 添加了详细的文档和测试工具

新增功能:
- 任务清理管理界面
- 任务归档和清理日志
- API监控和诊断工具
- 完整的测试套件

技术改进:
- 修复了Repository方法调用错误
- 统一了模型方法调用
- 改进了类型安全性
- 优化了代码结构和可维护性

demo/cleanup_failed_tasks.sql

@@ -0,0 +1,26 @@
+-- 清理失败任务的SQL脚本
+
+-- 删除失败的任务队列记录
+DELETE FROM task_queue WHERE status = 'FAILED';
+
+-- 删除失败的图生视频任务
+DELETE FROM image_to_video_tasks WHERE status = 'FAILED';
+
+-- 删除失败的文生视频任务  
+DELETE FROM text_to_video_tasks WHERE status = 'FAILED';
+
+-- 删除相关的积分冻结记录
+DELETE FROM points_freeze_records WHERE status IN ('FROZEN', 'RETURNED', 'DEDUCTED') 
+AND task_id IN (
+    SELECT task_id FROM task_queue WHERE status = 'FAILED'
+);
+
+-- 显示清理结果
+SELECT 'task_queue' as table_name, COUNT(*) as remaining_count FROM task_queue
+UNION ALL
+SELECT 'image_to_video_tasks' as table_name, COUNT(*) as remaining_count FROM image_to_video_tasks  
+UNION ALL
+SELECT 'text_to_video_tasks' as table_name, COUNT(*) as remaining_count FROM text_to_video_tasks
+UNION ALL
+SELECT 'points_freeze_records' as table_name, COUNT(*) as remaining_count FROM points_freeze_records;
+