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/Requests/Material/MaterialUpdateRequest.php

@@ -1,32 +0,0 @@
-<?php
-
-namespace App\Http\Requests\Material;
-
-use Illuminate\Foundation\Http\FormRequest;
-
-class MaterialUpdateRequest extends FormRequest
-{
-    public function authorize(): bool
-    {
-        return true;
-    }
-
-    public function rules(): array
-    {
-        return [
-            'category_id' => 'nullable|integer',
-            'name' => 'sometimes|string|max:100',
-            'unit' => 'sometimes|string|max:20',
-            'is_inspection' => 'nullable|in:Y,N',
-            'search_tag' => 'nullable|string|max:255',
-            'remarks' => 'nullable|string|max:500',
-            'attributes' => 'nullable|array',
-            'attributes.*.label' => 'required|string|max:50',
-            'attributes.*.value' => 'required|string|max:100',
-            'attributes.*.unit' => 'nullable|string|max:20',
-            'options' => 'nullable|array',
-            'material_code' => 'nullable|string|max:30',
-            'specification' => 'nullable|string|max:255',
-        ];
-    }
-}