修复bug和清理调试代码

1. email_service.py: 删除未定义的log_email_send调用（send_email内部已记录日志）
2. app.py: 删除[DEBUG run_task]调试打印语句
3. playwright_automation.py: 删除[调试]诊断日志块

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

email_service.py

@@ -2112,22 +2112,8 @@ def send_batch_task_complete_email(
     )
 
     if result['success']:
-        # 记录发送日志
-        log_email_send(
-            email_type='batch_task_complete',
-            to_email=email,
-            subject=f'定时任务完成 - {schedule_name}',
-            success=True
-        )
         return {'success': True}
     else:
-        log_email_send(
-            email_type='batch_task_complete',
-            to_email=email,
-            subject=f'定时任务完成 - {schedule_name}',
-            success=False,
-            error=result.get('error', '')
-        )
         return {'success': False, 'error': result.get('error', '发送失败')}