feat: enhance train scheduling and contract management features

- Added StationWorkControls to manage loading/unloading phases in TrainScheduleV2DetailPage.
- Implemented API endpoints for recording station work and managing wagon detach requests.
- Updated contract templates to include Ethiopian customs handling options.
- Enhanced shipment forms to collect customs clearing agent details for without-customs bookings.
- Introduced NUMBER_OF_WAGONS as a unit of measure for bulk cargo, allowing customers to specify wagon counts.
- Improved validation for customs clearing agent information in shipment forms.
- Updated various components and services to accommodate new features and ensure data integrity.

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

@@ -481,6 +481,12 @@ export const URL_CONSTANTS = {
     FINALIZE: (id: string) => `/train-scheduling/schedules/${id}/finalize`,
     DISPATCH: (id: string) => `/train-scheduling/schedules/${id}/dispatch`,
     YARD_WORK: (id: string) => `/train-scheduling/schedules/${id}/yard-work`,
+    STATION_WORK: (
+      id: string,
+      yardId: string,
+      phase: "loading" | "unloading",
+      edge: "start" | "end",
+    ) => `/train-scheduling/schedules/${id}/stations/${yardId}/${phase}/${edge}`,
     BOOKING_LOAD: (id: string, bookingId: string) =>
       `/train-scheduling/schedules/${id}/bookings/${bookingId}/load`,
     BOOKING_UNLOAD: (id: string, bookingId: string) =>