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在当前项目中增加 flask/scheduler 扩展:含调度器、任务装饰器(interval/delay/cron)、cron 解析、状态存储、指标与管理蓝图(/_internal/metrics, POST /_internal/tasks//run, /reload),任务状态字段与异常记录,配置项 SCHEDULER_ENABLED/AUTOSTART/TICK_INTERVAL,示例 3 个任务,每 10 秒、延迟 5 秒、cron */2 * *。