feat: [생산지시] 전용 API 엔드포인트 신규 생성

- ProductionOrderService: 목록(index), 통계(stats), 상세(show) 구현
  - Order 기반 생산지시 대상 필터링 (IN_PROGRESS~SHIPPED)
  - workOrderProgress 가공 필드 (total/completed/inProgress)
  - production_ordered_at (첫 WorkOrder created_at 기반)
  - BOM 공정 분류 추출 (order_nodes.options.bom_result)
- ProductionOrderController: FormRequest + ApiResponse 패턴
- ProductionOrderIndexRequest: search, production_status, sort, pagination 검증
- ProductionOrderApi.php: Swagger 문서 (목록/통계/상세)
- production.php: GET /production-orders, /stats, /{orderId} 라우트 추가

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

app/Http/Controllers/Api/V1/ProductionOrderController.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Helpers\ApiResponse;
+use App\Http\Controllers\Controller;
+use App\Http\Requests\ProductionOrder\ProductionOrderIndexRequest;
+use App\Services\ProductionOrderService;
+use Illuminate\Http\JsonResponse;
+
+class ProductionOrderController extends Controller
+{
+    public function __construct(
+        private readonly ProductionOrderService $service
+    ) {}
+
+    /**
+     * 생산지시 목록 조회
+     */
+    public function index(ProductionOrderIndexRequest $request): JsonResponse
+    {
+        $result = $this->service->index($request->validated());
+
+        return ApiResponse::success($result, __('message.fetched'));
+    }
+
+    /**
+     * 생산지시 상태별 통계
+     */
+    public function stats(): JsonResponse
+    {
+        $stats = $this->service->stats();
+
+        return ApiResponse::success($stats, __('message.fetched'));
+    }
+
+    /**
+     * 생산지시 상세 조회
+     */
+    public function show(int $orderId): JsonResponse
+    {
+        try {
+            $detail = $this->service->show($orderId);
+
+            return ApiResponse::success($detail, __('message.fetched'));
+        } catch (\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
+            return ApiResponse::error(__('error.order.not_found'), 404);
+        }
+    }
+}