feat(warehouse): batch 3 — loading, dispatch & train-departure visibility

- WarehouseLoading entity + Batch3 migration (wagon loading records)
- wagon-aware load() with validation; dispatch moved to PATCH
- read-only SchedulingReadFacade (schedule/wagon/departure) — never writes scheduling
- new endpoints: GET /warehouse-loadings, loadable-wagons, booking schedule
- Loading Queue / Loaded Inventory / Dispatch Queue pages + routes + sidebar
- FreightVisual illustrations (page heroes + empty states)
- booking detail: loaded/dispatched/wagon + read-only train schedule

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -206,12 +206,19 @@ export const URL_CONSTANTS = {
     RESERVE: '/warehouse-inventory/reserve',
     READY_FOR_LOADING: '/warehouse-inventory/ready-for-loading',
     INQUIRY: '/warehouse-inventory/inquiry',
+    LOADABLE_WAGONS: '/warehouse-inventory/loadable-wagons',
+    BOOKING_SCHEDULE: (bookingId: string) => `/warehouse-inventory/booking/${bookingId}/schedule`,
     MOVE: (id: string) => `/warehouse-inventory/${id}/move`,
     MOVEMENTS: (id: string) => `/warehouse-inventory/${id}/movements`,
     ACTIVITY: (id: string) => `/warehouse-inventory/${id}/activity`,
+    LOADINGS: (id: string) => `/warehouse-inventory/${id}/loadings`,
     STORE: (id: string) => `/warehouse-inventory/${id}/store`,
     MARK_READY: (id: string) => `/warehouse-inventory/${id}/ready-for-loading`,
     LOAD: (id: string) => `/warehouse-inventory/${id}/load`,
     DISPATCH: (id: string) => `/warehouse-inventory/${id}/dispatch`,
   },
+
+  WAREHOUSE_LOADINGS: {
+    BASE: '/warehouse-loadings',
+  },
 };