feat(train-crew): implement crew assignment functionality

- Added TrainCrewAssignment module with controller and service for managing crew assignments.
- Integrated TrainCrewAssignmentService into TrainSchedulingService to ensure crew readiness before train dispatch.
- Updated TrainScheduling module to include TrainCrewModule for dependency injection.
- Introduced new permissions for assigning train crew in freight permissions registry.
- Enhanced front-end ScheduleCrewPage to allow assignment of crew members to train schedules, including validation and UI for adding/removing drivers and support crew.
- Created trainCrewAssignment.service to handle API interactions for crew assignments.

apps/edr-freight-api/src/modules/train-scheduling/services/train-scheduling.service.ts

@@ -66,6 +66,7 @@ import { WagonBookingAllocation } from '../../train-schedules/entities/wagon-boo
 import { TrainScheduleBookingsRepository } from '../../train-schedules/train-schedule-bookings.repository';
 import { TrainSchedulesRepository } from '../../train-schedules/train-schedules.repository';
 import { TrainCompositionRemovalLogRepository } from '../../train-schedules/train-composition-removal-log.repository';
+import { TrainCrewAssignmentService } from '../../train-crew/train-crew-assignment.service';
 import { WagonAllocationBulkLoadsRepository } from '../../train-schedules/wagon-allocation-bulk-loads.repository';
 import { WagonAllocationContainerItemsRepository } from '../../train-schedules/wagon-allocation-container-items.repository';
 import { WagonBookingAllocationsRepository } from '../../train-schedules/wagon-booking-allocations.repository';
@@ -449,6 +450,9 @@ export class TrainSchedulingService {
     // Trailing + @Optional so the positional constructors in the existing specs
     // keep working; production always resolves it from ExportsModule.
     @Optional() private readonly tabularExport?: TabularExportService,
+    // Crew composition gate (ITLMS Rolling Stock §1.2 "prior to departure").
+    // Trailing + @Optional for the same positional-spec reason as above.
+    @Optional() private readonly trainCrewAssignments?: TrainCrewAssignmentService,
   ) {}
 
   /** Physical wagons behind a set of booking allocations (via their slots), for cargo history rows. */
@@ -3027,6 +3031,11 @@ export class TrainSchedulingService {
         'End the loading window at the origin station before dispatching',
       );
     }
+    // On-board crew must be complete before the train leaves — ITLMS Rolling
+    // Stock §1.2 enforces composition "prior to departure", so an incomplete
+    // crew saves freely on the assignment page but cannot depart. Optional
+    // dependency: the positional spec constructors omit it.
+    await this.trainCrewAssignments?.assertCrewReadyForDispatch(scheduleId);
     // Staff may record the departure after the fact — past is fine, future is not.
     const now = dto.actualDepartureAt ? new Date(dto.actualDepartureAt) : new Date();
     this.assertNotFuture(now, 'Departure time');