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/modules/train-scheduling/train-scheduling.controller.ts

@@ -8,6 +8,7 @@ import {
 } from "@nestjs/common";
 import { CurrentUser } from "@edr/api-common";
 import {
+  BookingDocReviewAlert,
   TrainSchedulingCancel,
   TrainSchedulingCreate,
   TrainSchedulingReschedule,
@@ -747,6 +748,18 @@ export class TrainSchedulingController {
     return this.trainSchedulingService.getContainerTrainScheduleById(id);
   }
 
+  @Get("doc-review-alert")
+  // Dedicated permission, not scheduling or bookings:view — the alarm is meant
+  // for the position types that actually decide operation requests.
+  @BookingDocReviewAlert()
+  @ApiOperation({
+    summary:
+      "Nearest document-review deadline that still has un-accepted booking requests behind it (null when there is none) — drives the backoffice header countdown",
+  })
+  async getDocReviewAlert() {
+    return this.bookingWindowService.getDocReviewAlert();
+  }
+
   @Post("schedules/:id/doc-review-complete")
   @TrainSchedulingUpdate()
   @ApiOperation({