feat: 添加任务状态级联触发器，优化支付和做同款功能

主要更新:
- 添加 MySQL 触发器实现 task_status 表到其他表的状态级联
- 移除控制器中的多表状态检查代码
- 完善做同款功能，支持参数传递
- 支付宝 USD 转 CNY 汇率转换
- 修复状态枚举映射问题

注意: 触发器仅在 task_status 更新时触发，部分代码仍直接更新业务表

demo/docs/task_status_cascade_trigger.sql

@@ -0,0 +1,108 @@
+-- ============================================
+-- 任务状态级联更新触发器
+-- 
+-- 功能：当 task_status 表状态更新时，自动同步到：
+--   - task_queue
+--   - user_works  
+--   - text_to_video_tasks
+--   - image_to_video_tasks
+--   - storyboard_video_tasks
+--
+-- 执行方式：在 MySQL 客户端中执行此脚本
+-- ============================================
+
+-- 选择数据库
+USE aigc_platform;
+
+-- 先删除已存在的触发器
+DROP TRIGGER IF EXISTS trg_task_status_update;
+
+-- 修改分隔符
+DELIMITER //
+
+-- 创建触发器
+-- 状态枚举说明：
+--   task_status/task_queue: PENDING, PROCESSING, COMPLETED, FAILED, CANCELLED, TIMEOUT
+--   user_works: PROCESSING, COMPLETED, FAILED, DELETED (缺少 PENDING, CANCELLED, TIMEOUT)
+--   业务表: PENDING, PROCESSING, COMPLETED, FAILED, CANCELLED (缺少 TIMEOUT)
+-- 
+-- 注意：分镜图(_image后缀)在task_status表中没有独立记录，无需处理
+CREATE TRIGGER trg_task_status_update
+AFTER UPDATE ON task_status
+FOR EACH ROW
+BEGIN
+    IF NEW.status <> OLD.status THEN
+        
+        -- 1. 更新 task_queue 表（状态枚举一致，直接同步）
+        UPDATE task_queue 
+        SET status = NEW.status,
+            updated_at = NOW(),
+            error_message = CASE WHEN NEW.status IN ('FAILED', 'TIMEOUT') THEN NEW.error_message ELSE error_message END
+        WHERE task_id = NEW.task_id;
+        
+        -- 2. 更新 user_works 表（需要状态映射）
+        -- PENDING -> PROCESSING, CANCELLED/TIMEOUT -> FAILED
+        UPDATE user_works 
+        SET status = CASE 
+            WHEN NEW.status IN ('PENDING', 'PROCESSING') THEN 'PROCESSING'
+            WHEN NEW.status = 'COMPLETED' THEN 'COMPLETED'
+            WHEN NEW.status IN ('FAILED', 'CANCELLED', 'TIMEOUT') THEN 'FAILED'
+            ELSE status
+        END,
+        updated_at = NOW(),
+        result_url = CASE WHEN NEW.status = 'COMPLETED' AND NEW.result_url IS NOT NULL THEN NEW.result_url ELSE result_url END
+        WHERE task_id = NEW.task_id;
+        
+        -- 3. 更新业务任务表（TIMEOUT 映射为 FAILED）
+        
+        -- 文生视频 (txt2vid_*)
+        IF NEW.task_id LIKE 'txt2vid_%' THEN
+            UPDATE text_to_video_tasks 
+            SET status = CASE WHEN NEW.status = 'TIMEOUT' THEN 'FAILED' ELSE NEW.status END,
+                updated_at = NOW(),
+                error_message = CASE WHEN NEW.status IN ('FAILED', 'TIMEOUT') THEN COALESCE(NEW.error_message, '任务超时') ELSE error_message END,
+                result_url = CASE WHEN NEW.status = 'COMPLETED' AND NEW.result_url IS NOT NULL THEN NEW.result_url ELSE result_url END
+            WHERE task_id = NEW.task_id;
+        END IF;
+        
+        -- 图生视频 (img2vid_*)
+        IF NEW.task_id LIKE 'img2vid_%' THEN
+            UPDATE image_to_video_tasks 
+            SET status = CASE WHEN NEW.status = 'TIMEOUT' THEN 'FAILED' ELSE NEW.status END,
+                updated_at = NOW(),
+                error_message = CASE WHEN NEW.status IN ('FAILED', 'TIMEOUT') THEN COALESCE(NEW.error_message, '任务超时') ELSE error_message END,
+                result_url = CASE WHEN NEW.status = 'COMPLETED' AND NEW.result_url IS NOT NULL THEN NEW.result_url ELSE result_url END
+            WHERE task_id = NEW.task_id;
+        END IF;
+        
+        -- 分镜视频 (storyboard_*)
+        IF NEW.task_id LIKE 'storyboard_%' THEN
+            UPDATE storyboard_video_tasks 
+            SET status = CASE WHEN NEW.status = 'TIMEOUT' THEN 'FAILED' ELSE NEW.status END,
+                updated_at = NOW(),
+                error_message = CASE WHEN NEW.status IN ('FAILED', 'TIMEOUT') THEN COALESCE(NEW.error_message, '任务超时') ELSE error_message END,
+                result_url = CASE WHEN NEW.status = 'COMPLETED' AND NEW.result_url IS NOT NULL THEN NEW.result_url ELSE result_url END
+            WHERE task_id = NEW.task_id;
+        END IF;
+        
+    END IF;
+END//
+
+-- 恢复分隔符
+DELIMITER ;
+
+-- 验证触发器已创建
+SHOW TRIGGERS LIKE 'task_status';
+
+-- ============================================
+-- 使用说明：
+-- 
+-- 1. 连接到 MySQL 数据库
+-- 2. 选择对应的数据库: USE your_database_name;
+-- 3. 执行此脚本
+-- 
+-- 注意事项：
+-- - 触发器会在 task_status 表的 status 字段更新时自动执行
+-- - 确保所有表都有 task_id 字段作为关联键
+-- - 状态值使用字符串存储（如 'COMPLETED', 'FAILED' 等）
+-- ============================================