feat: [bending] 절곡품 관리 API 완성 + 데이터 마이그레이션

- GuiderailModelController/Service/Resource: 가이드레일/케이스/하단마감재 통합 CRUD
- item_category 필터 (GUIDERAIL_MODEL/SHUTTERBOX_MODEL/BOTTOMBAR_MODEL)
- BendingItemResource: legacy_bending_num 노출 추가
- ApiKeyMiddleware: guiderail-models, files 화이트리스트 추가
- Swagger: BendingItemApi, GuiderailModelApi 문서 (케이스/하단마감재 필드 포함)
- 마이그레이션 커맨드 5개: GuiderailImportLegacy, BendingProductImportLegacy, BendingImportImages, BendingModelImportImages, BendingModelImportAssemblyImages
- 데이터: GR 20건 + SB 30건 + BB 10건 + 이미지 473건 R2 업로드

app/Http/Resources/Api/V1/GuiderailModelResource.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Http\Resources\Api\V1;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class GuiderailModelResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        $components = $this->getOption('components', []);
+        $materialSummary = $this->getOption('material_summary');
+
+        // material_summary가 없으면 components에서 계산
+        if (empty($materialSummary) && ! empty($components)) {
+            $materialSummary = $this->calcMaterialSummary($components);
+        }
+
+        return [
+            'id' => $this->id,
+            'code' => $this->code,
+            'name' => $this->name,
+            'item_type' => $this->item_type,
+            'item_category' => $this->item_category,
+            'is_active' => $this->is_active,
+            // 모델 속성
+            'model_name' => $this->getOption('model_name'),
+            'check_type' => $this->getOption('check_type'),
+            'rail_width' => $this->getOption('rail_width'),
+            'rail_length' => $this->getOption('rail_length'),
+            'finishing_type' => $this->getOption('finishing_type'),
+            'item_sep' => $this->getOption('item_sep'),
+            'model_UA' => $this->getOption('model_UA'),
+            'search_keyword' => $this->getOption('search_keyword'),
+            'author' => $this->getOption('author'),
+            'memo' => $this->getOption('memo'),
+            'registration_date' => $this->getOption('registration_date'),
+            // 케이스(SHUTTERBOX_MODEL) 전용
+            'exit_direction' => $this->getOption('exit_direction'),
+            'front_bottom_width' => $this->getOption('front_bottom_width'),
+            'box_width' => $this->getOption('box_width'),
+            'box_height' => $this->getOption('box_height'),
+            // 하단마감재(BOTTOMBAR_MODEL) 전용
+            'bar_width' => $this->getOption('bar_width'),
+            'bar_height' => $this->getOption('bar_height'),
+            // 부품 조합
+            'components' => $components,
+            'material_summary' => $materialSummary,
+            'component_count' => count($components),
+            // 메타
+            'created_at' => $this->created_at?->format('Y-m-d H:i:s'),
+            'updated_at' => $this->updated_at?->format('Y-m-d H:i:s'),
+        ];
+    }
+
+    private function calcMaterialSummary(array $components): array
+    {
+        $summary = [];
+        foreach ($components as $comp) {
+            $material = $comp['material'] ?? null;
+            $widthSum = $comp['width_sum'] ?? 0;
+            $qty = $comp['quantity'] ?? 1;
+            if ($material && $widthSum) {
+                $summary[$material] = ($summary[$material] ?? 0) + ($widthSum * $qty);
+            }
+        }
+
+        return $summary;
+    }
+}