add company stamp upload functionality for contract signing

- Introduced StampUpload component for uploading company stamp images.
- Integrated stamp upload in contract signing modal, supporting PNG and JPG formats.
- Implemented validation for file type and size (max 5 MB).
- Added visual feedback for drag-and-drop functionality.
- Updated contract-related pages to handle duplicate contract alerts and pricing notices.
- Enhanced contract expiry management with a nightly sweep service.
- Added unit tests for new features and updated existing tests for contract handling.

apps/edr-freight-web/backoffice/src/constants/URLS.ts

@@ -294,6 +294,7 @@ export const URL_CONSTANTS = {
       `/train-scheduling/schedules/${id}/run-allocation`,
     DOC_REVIEW_COMPLETE: (id: string) =>
       `/train-scheduling/schedules/${id}/doc-review-complete`,
+    DOC_REVIEW_ALERT: "/train-scheduling/doc-review-alert",
     ASSIGN_UNASSIGNED_BOOKING: (id: string) =>
       `/train-scheduling/schedules/${id}/assign-unassigned-booking`,
     BOOKING_WINDOW: (id: string) =>