feat(warehouse,last-mile): truck load size rule, dedup last-mile, driver-required + arrival prefill

Truck loading:
- loadTruck enforces max 2 containers / one 40ft (two 20ft) and auto-marks an
  assigned truck arrived on load; container-items payload + modal expose
  container size with a client-side selection cap.
- Show "#x containers pending assignment" in the portal truck card and the
  backoffice container modal.

Last-mile:
- create() is idempotent — return the existing record for a booking instead of
  inserting a duplicate delivery row (fixed the same booking showing twice in
  Assign-Mile).
- setVehicles/update reject a truck with no assigned driver; the Assign toast
  now surfaces the reason.
- New GET /last-mile/booking/:id/arrival-trucks returns assigned EDR trucks with
  driver details; ReleaseOrderModal fetches and auto-fills them so an assigned
  EDR truck no longer reads as "not assigned yet".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/edr-freight-api/src/modules/warehouses/warehouse-inventory.service.ts

@@ -2830,6 +2830,7 @@ export class WarehouseInventoryService {
     Array<{
       containerNumber: string;
       goods: string | null;
+      containerSize: string | null;
       stage: 'PENDING' | 'RECEIVED' | 'GRN' | 'ASSIGNED' | 'LOADED' | 'LEFT' | 'DELIVERED';
       grnNumber: string | null;
       truckAssignmentId: string | null;
@@ -2846,6 +2847,7 @@ export class WarehouseInventoryService {
     const rows: Array<{
       containerNumber: string;
       goods: string | null;
+      containerSize: string | null;
       received: boolean;
       grnNumber: string | null;
       truckAssignmentId: string | null;
@@ -2860,6 +2862,7 @@ export class WarehouseInventoryService {
     }> = await this.dataSource.query(
       `SELECT bcu.container_number AS "containerNumber",
               COALESCE(ct.cargo_type_name, b.cargo_free_text) AS goods,
+              bc.container_size AS "containerSize",
               bcu.received_to_port AS received,
               bcu.grn_number AS "grnNumber",
               ctc.assignment_id AS "truckAssignmentId",
@@ -2896,6 +2899,7 @@ export class WarehouseInventoryService {
     return rows.map((r) => ({
       containerNumber: r.containerNumber,
       goods: r.goods,
+      containerSize: r.containerSize,
       // A container the customer assigned to a truck is ASSIGNED (planned); it
       // only becomes LOADED once the operator loads it (loaded_at) on truck
       // leaving. Departed → LEFT, delivered → DELIVERED.