feat: [bending] 절곡품 기초관리 API 구현

- BendingItemController: CRUD + filters 엔드포인트 (pagination 메타 보존)
- BendingItemService: items 테이블 item_category=BENDING 필터 기반
- BendingItemResource: options → 최상위 필드 노출 + 계산값(width_sum, bend_count)
- FormRequest: Index/Store/Update 유효성 검증 (unique:items,code 포함)
- BendingFillOptions: BD-* prefix/분류 속성 자동 보강 커맨드
- BendingImportLegacy: chandj 레거시 전개도(bendingData) 임포트 커맨드 (125/170건 매칭)
- ensureContext: Bearer 토큰 없이 X-TENANT-ID 헤더로 컨텍스트 설정

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

@@ -0,0 +1,95 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Helpers\ApiResponse;
+use App\Http\Controllers\Controller;
+use App\Http\Requests\Api\V1\BendingItemIndexRequest;
+use App\Http\Requests\Api\V1\BendingItemStoreRequest;
+use App\Http\Requests\Api\V1\BendingItemUpdateRequest;
+use App\Http\Resources\Api\V1\BendingItemResource;
+use App\Services\BendingItemService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class BendingItemController extends Controller
+{
+    public function __construct(private BendingItemService $service) {}
+
+    /**
+     * Bearer 토큰 없이 X-TENANT-ID 헤더로 컨텍스트 설정
+     */
+    private function ensureContext(Request $request): void
+    {
+        if (! app()->bound('tenant_id') || ! app('tenant_id')) {
+            $tenantId = (int) ($request->header('X-TENANT-ID') ?: 287);
+            app()->instance('tenant_id', $tenantId);
+        }
+        if (! app()->bound('api_user') || ! app('api_user')) {
+            // mng에서 Bearer 토큰 없이 호출 시 시스템 사용자(1)로 설정
+            app()->instance('api_user', 1);
+        }
+    }
+
+    public function index(BendingItemIndexRequest $request): JsonResponse
+    {
+        $this->ensureContext($request);
+
+        return ApiResponse::handle(function () use ($request) {
+            $paginator = $this->service->list($request->validated());
+            $paginator->getCollection()->transform(fn ($item) => (new BendingItemResource($item))->resolve());
+
+            return $paginator;
+        }, __('message.fetched'));
+    }
+
+    public function filters(Request $request): JsonResponse
+    {
+        $this->ensureContext($request);
+
+        return ApiResponse::handle(
+            fn () => $this->service->filters(),
+            __('message.fetched')
+        );
+    }
+
+    public function show(Request $request, int $id): JsonResponse
+    {
+        $this->ensureContext($request);
+
+        return ApiResponse::handle(
+            fn () => new BendingItemResource($this->service->find($id)),
+            __('message.fetched')
+        );
+    }
+
+    public function store(BendingItemStoreRequest $request): JsonResponse
+    {
+        $this->ensureContext($request);
+
+        return ApiResponse::handle(
+            fn () => new BendingItemResource($this->service->create($request->validated())),
+            __('message.created')
+        );
+    }
+
+    public function update(BendingItemUpdateRequest $request, int $id): JsonResponse
+    {
+        $this->ensureContext($request);
+
+        return ApiResponse::handle(
+            fn () => new BendingItemResource($this->service->update($id, $request->validated())),
+            __('message.updated')
+        );
+    }
+
+    public function destroy(Request $request, int $id): JsonResponse
+    {
+        $this->ensureContext($request);
+
+        return ApiResponse::handle(
+            fn () => $this->service->delete($id),
+            __('message.deleted')
+        );
+    }
+}