Fix cron unexpectedly fails to start after being enabled #760

[markshust]

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[what-the-diff]

PR Summary

• Improvement in the Scheduler (Cron) Service
  We have enhanced the routine or "cron" service, adding a new function where we create a .cron-enabled file every time this service is turned on, and remove it when it's turned off. This change allows us to keep track of its status more accurately.

• Adjustments to the Startup Process
  Minor modifications have been made to the system's start-up script. Now, every time the system starts, it checks whether the cron service was enabled initially. If it finds that to be the case, the system will automatically restart the cron service, ensuring its efficient and reliable operation.