* refactor: consolidate order lifecycle validation logic and remove slot lifecycle
- Streamlined the order lifecycle by consolidating validation logic and removing redundant error handling.
- Deleted the slot lifecycle file to simplify the codebase, as its functionality is no longer needed.
- This change enhances maintainability and reduces complexity in the order management system.
* feat: enhance Telegram notification heading for order updates
- Updated the heading emoji logic to display a checkered flag for completed orders and a pencil for updates, improving clarity in notifications.
- Added specific handling for completed records in the notification heading to differentiate between updated and completed statuses.
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