feat: [outbound] 배차차량 관리 API — CRUD + options JSON 정책

- VehicleDispatchService: index(검색/필터/페이지네이션), stats(선불/착불/합계), show, update
- VehicleDispatchController + VehicleDispatchUpdateRequest
- options JSON 컬럼 추가 (dispatch_no, status, freight_cost_type, supply_amount, vat, total_amount, writer)
- ShipmentService.syncDispatches에 options 필드 지원 추가
- inventory.php에 vehicle-dispatches 라우트 4개 등록

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

app/Models/Tenants/ShipmentVehicleDispatch.php

@@ -22,12 +22,14 @@ class ShipmentVehicleDispatch extends Model
         'vehicle_no',
         'driver_contact',
         'remarks',
+        'options',
     ];
 
     protected $casts = [
         'seq' => 'integer',
         'shipment_id' => 'integer',
         'arrival_datetime' => 'datetime',
+        'options' => 'array',
     ];
 
     /**