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-api/src/common/booking-guards.ts

@@ -23,6 +23,14 @@ export const StaffReference = () => applyDecorators(UseGuards(JwtGuard));
 
 export const BookingView = () => BookingStaff(FREIGHT_PERMS.bookings.view);
 
+/**
+ * The document-review countdown in the backoffice header. Its own permission so
+ * it can be granted to exactly the position types that decide operation
+ * requests, instead of every holder of bookings:view.
+ */
+export const BookingDocReviewAlert = () =>
+  BookingStaff(FREIGHT_PERMS.bookings.docReviewAlert);
+
 export const TrainSchedulingView = () =>
   BookingStaff(FREIGHT_PERMS.trainScheduling.view);