添加任务自动重试机制

- 任务执行失败（非登录失败）时自动重试，最多重试2次
- 重试间隔5秒，给前端显示状态"等待重试"
- 添加sys模块导入修复

🤖 Generated with Claude Code

app.py

@@ -23,6 +23,7 @@ import threading
 import time
 import json
 import os
+import sys
 import secrets  # 安全修复: 使用加密安全的随机数生成
 from datetime import datetime, timedelta, timezone
 from functools import wraps
@@ -1942,9 +1943,14 @@ def get_user_semaphore(user_id):
     return user_semaphores[user_id]
 
 
-def run_task(user_id, account_id, browse_type, enable_screenshot=True, source="manual"):
-    """运行自动化任务"""
-    print(f"[DEBUG run_task] account={account_id}, enable_screenshot={enable_screenshot} (类型:{type(enable_screenshot).__name__}), source={source}")
+def run_task(user_id, account_id, browse_type, enable_screenshot=True, source="manual", retry_count=0):
+    """运行自动化任务
+
+    Args:
+        retry_count: 当前重试次数，用于自动重试机制（最多重试2次）
+    """
+    MAX_AUTO_RETRY = 2  # 最大自动重试次数
+    print(f"[DEBUG run_task] account={account_id}, enable_screenshot={enable_screenshot} (类型:{type(enable_screenshot).__name__}), source={source}, retry={retry_count}")
     
     if user_id not in user_accounts or account_id not in user_accounts[user_id]:
         return
@@ -2399,10 +2405,30 @@ def run_task(user_id, account_id, browse_type, enable_screenshot=True, source="m
                     socketio.emit('account_update', account.to_dict(), room=f'user_{user_id}')
                     log_to_client(f"截图功能已禁用,跳过截图", user_id, account_id)
             else:
-                # 任务非正常完成，重置状态为未开始
+                # 任务非正常完成
                 if account.status not in ["登录失败", "出错"]:
                     account.status = "未开始"
                     socketio.emit('account_update', account.to_dict(), room=f'user_{user_id}')
+                # 自动重试机制：非登录失败的情况下，自动重试
+                elif account.status == "出错" and retry_count < MAX_AUTO_RETRY:
+                    # 延迟5秒后重新加入队列
+                    log_to_client(f"⚠ 任务执行失败，5秒后自动重试 ({retry_count + 1}/{MAX_AUTO_RETRY})...", user_id, account_id)
+                    account.status = "等待重试"
+                    socketio.emit('account_update', account.to_dict(), room=f'user_{user_id}')
+
+                    def delayed_retry():
+                        time.sleep(5)
+                        if not account.should_stop:
+                            log_to_client(f"🔄 开始第 {retry_count + 1} 次自动重试...", user_id, account_id)
+                            thread = threading.Thread(
+                                target=run_task,
+                                args=(user_id, account_id, browse_type, enable_screenshot, source, retry_count + 1),
+                                daemon=True
+                            )
+                            thread.start()
+                            active_tasks[account_id] = thread
+
+                    threading.Thread(target=delayed_retry, daemon=True).start()
 
     finally:
         # 释放用户级信号量