feat(warehouse): Batch 7 — Import Arrive Queue (arrived import trains, read-only)

- SchedulingReadFacade: importArriveQueue() + importTrainDetail() — read-only SELECTs only,
  direction derived from origin/destination station countries (route-based), so EXPORT/DOMESTIC
  trains are excluded. Per-train booking/container/cargo counts.
- GET /warehouse-inventory/import/arrive-queue + /import/trains/:scheduleId/items
- Import tab restructured into sub-tabs: Arrive Queue (implemented) / Unloaded Queue /
  Dispatch Queue (placeholders for next batch)
- ImportArriveQueueTab: train table (schedule id, train #, route, origin, destination, arrival,
  bookings/containers/cargoes, status) with Open (expandable assigned-items detail) + Auto Unload
  (reuses existing per-booking unload endpoint over the train's bookings)
- Batch7TestDataSeeder: 1 arrived IMPORT train (SEED-IMP-001) + 1 arrived EXPORT train
  (SEED-EXP-001, proves exclusion); idempotent
- Train schedule service logic untouched (facade is SELECT-only)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/edr-freight-web/backoffice/src/services/warehouse.service.ts

@@ -37,6 +37,8 @@ import type {
   BulkInspectResult,
   ReadyToLoadRow,
   BulkDispatchResult,
+  ImportTrain,
+  ImportTrainItem,
   ReserveInventoryPayload,
   SaveWarehousePayload,
   SaveYardPayload,
@@ -140,6 +142,10 @@ export const warehouseService = {
     apiClient.post<BulkDispatchResult>(URL_CONSTANTS.WAREHOUSE_INVENTORY.BULK_DISPATCH_EXPORT, {
       inventoryIds,
     }),
+  importArriveQueue: () =>
+    apiClient.get<ImportTrain[]>(URL_CONSTANTS.WAREHOUSE_INVENTORY.IMPORT_ARRIVE_QUEUE),
+  importTrainItems: (scheduleId: string) =>
+    apiClient.get<ImportTrainItem[]>(URL_CONSTANTS.WAREHOUSE_INVENTORY.IMPORT_TRAIN_ITEMS(scheduleId)),
   move: (id: string, payload: MoveInventoryPayload) =>
     apiClient.post<WarehouseInventoryItem>(URL_CONSTANTS.WAREHOUSE_INVENTORY.MOVE(id), payload),
   movements: (id: string) =>