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-api/src/modules/train-scheduling/controllers/train-scheduling.controller.ts

@@ -18,14 +18,19 @@ import {
   TrainSchedulingCreate,
   TrainSchedulingEditTrainNumber,
   TrainSchedulingLoad,
+  TrainSchedulingLoadingEnd,
+  TrainSchedulingLoadingStart,
   TrainSchedulingReschedule,
   TrainSchedulingUnload,
+  TrainSchedulingUnloadingEnd,
+  TrainSchedulingUnloadingStart,
   TrainSchedulingRulesManage,
   TrainSchedulingUpdate,
   TrainSchedulingView,
 } from "../../../common/booking-guards";
 import { FREIGHT_PERMS } from "../../../seed/freight-permissions.registry";
 import { AcceptIntercityBookingsDto } from "../dto/accept-intercity-bookings.dto";
+import { StationWorkDto } from "../dto/station-work.dto";
 import { AssignBookingsDto } from "../dto/assign-bookings.dto";
 import { AssignUnassignedBookingDto } from "../dto/assign-unassigned-booking.dto";
 import { SwitchGovernmentBookingDto } from "../dto/switch-government-booking.dto";
@@ -614,6 +619,68 @@ export class TrainSchedulingController {
     return this.bookingJourneyService.listYardWork(id);
   }
 
+  @Post("schedules/:id/stations/:yardId/loading/start")
+  @TrainSchedulingLoadingStart()
+  @ApiOperation({
+    summary:
+      "Start (or correct, via `at`) this station's loading time window — required before bookings can be loaded there",
+  })
+  startStationLoading(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Param("yardId", ParseUUIDPipe) yardId: string,
+    @Body() dto: StationWorkDto,
+    @CurrentUser() user: AuthUserPayload,
+  ) {
+    return this.bookingJourneyService.recordStationWork(
+      id, yardId, "loading", "start", dto.at, resolveAuthUserId(user),
+    );
+  }
+
+  @Post("schedules/:id/stations/:yardId/loading/end")
+  @TrainSchedulingLoadingEnd()
+  @ApiOperation({ summary: "End (or correct, via `at`) this station's loading time window" })
+  endStationLoading(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Param("yardId", ParseUUIDPipe) yardId: string,
+    @Body() dto: StationWorkDto,
+    @CurrentUser() user: AuthUserPayload,
+  ) {
+    return this.bookingJourneyService.recordStationWork(
+      id, yardId, "loading", "end", dto.at, resolveAuthUserId(user),
+    );
+  }
+
+  @Post("schedules/:id/stations/:yardId/unloading/start")
+  @TrainSchedulingUnloadingStart()
+  @ApiOperation({
+    summary:
+      "Start (or correct, via `at`) this station's unloading time window — required before bookings can be unloaded there",
+  })
+  startStationUnloading(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Param("yardId", ParseUUIDPipe) yardId: string,
+    @Body() dto: StationWorkDto,
+    @CurrentUser() user: AuthUserPayload,
+  ) {
+    return this.bookingJourneyService.recordStationWork(
+      id, yardId, "unloading", "start", dto.at, resolveAuthUserId(user),
+    );
+  }
+
+  @Post("schedules/:id/stations/:yardId/unloading/end")
+  @TrainSchedulingUnloadingEnd()
+  @ApiOperation({ summary: "End (or correct, via `at`) this station's unloading time window" })
+  endStationUnloading(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Param("yardId", ParseUUIDPipe) yardId: string,
+    @Body() dto: StationWorkDto,
+    @CurrentUser() user: AuthUserPayload,
+  ) {
+    return this.bookingJourneyService.recordStationWork(
+      id, yardId, "unloading", "end", dto.at, resolveAuthUserId(user),
+    );
+  }
+
   @Post("schedules/:id/bookings/:bookingId/load")
   @TrainSchedulingLoad()
   @ApiOperation({