完善异步任务超时退款机制，对已存在的旧任务，超时后进行仅失败处理，对于新建任务，增加超时退款流程，超时时间通过环境变量TASK_TIMEOUT_MINUTES设置，默认24小时。
Improve the asynchronous task timeout refund mechanism. For existing old tasks, perform only failure processing after timeout. For newly created tasks, add a timeout refund process. The timeout duration is set via the environment variable TASK_TIMEOUT_MINUTES, defaulting to 24 hours.
Full Changelog: v0.11.0-alpha.1...v0.11.0-alpha.2