refactor: products/materials 테이블 및 관련 코드 삭제

- products, materials, product_components 테이블 삭제 마이그레이션
- FK 제약조건 정리 (orders, order_items, material_receipts, lots)
- 관련 Models 삭제: Product, Material, ProductComponent 등
- 관련 Controllers 삭제: ProductController, MaterialController, ProductBomItemController
- 관련 Services 삭제: ProductService, MaterialService, ProductBomService
- 관련 Requests, Swagger 파일 삭제
- 라우트 정리: /products, /materials 엔드포인트 제거

모든 품목 관리는 /items 엔드포인트로 통합됨
item_id_mappings 테이블에 ID 매핑 보존

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

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

@@ -1,82 +0,0 @@
-<?php
-
-namespace App\Http\Controllers\Api\V1;
-
-use App\Helpers\ApiResponse;
-use App\Http\Controllers\Controller;
-use App\Http\Requests\Product\ProductStoreRequest;
-use App\Http\Requests\Product\ProductUpdateRequest;
-use App\Services\ProductService;
-use Illuminate\Http\Request;
-
-class ProductController extends Controller
-{
-    public function __construct(private ProductService $service) {}
-
-    public function getCategory(Request $request)
-    {
-        return ApiResponse::handle(function () use ($request) {
-            return $this->service->getCategory($request);
-        }, __('message.product.category_fetched'));
-    }
-
-    // GET /products
-    public function index(Request $request)
-    {
-        return ApiResponse::handle(function () use ($request) {
-            return $this->service->index($request->all());
-        }, __('message.product.fetched'));
-    }
-
-    // POST /products
-    public function store(ProductStoreRequest $request)
-    {
-        return ApiResponse::handle(function () use ($request) {
-            return $this->service->store($request->validated());
-        }, __('message.product.created'));
-    }
-
-    // GET /products/{id}
-    public function show(int $id)
-    {
-        return ApiResponse::handle(function () use ($id) {
-            return $this->service->show($id);
-        }, __('message.product.fetched'));
-    }
-
-    // PATCH /products/{id}
-    public function update(int $id, ProductUpdateRequest $request)
-    {
-        return ApiResponse::handle(function () use ($id, $request) {
-            return $this->service->update($id, $request->validated());
-        }, __('message.product.updated'));
-    }
-
-    // DELETE /products/{id}
-    public function destroy(int $id)
-    {
-        return ApiResponse::handle(function () use ($id) {
-            $this->service->destroy($id);
-
-            return 'success';
-        }, __('message.product.deleted'));
-    }
-
-    // GET /products/search
-    public function search(Request $request)
-    {
-        return ApiResponse::handle(function () use ($request) {
-            return $this->service->search($request->all());
-        }, __('message.product.searched'));
-    }
-
-    // Note: toggle 메서드는 is_active 필드 제거로 인해 비활성화됨
-    // 필요시 attributes JSON이나 별도 필드로 구현
-    // POST /products/{id}/toggle
-    // public function toggle(int $id)
-    // {
-    //     return ApiResponse::handle(function () use ($id) {
-    //         return $this->service->toggle($id);
-    //     }, __('message.product.toggled'));
-    // }
-}