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>

database/migrations/2025_12_14_001312_drop_products_and_materials_tables.php

@@ -0,0 +1,150 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * products, materials 테이블 삭제
+     *
+     * 전제조건:
+     * - items 테이블로 데이터 마이그레이션 완료
+     * - item_id_mappings 테이블에 ID 매핑 보존
+     * - BOM의 child_item_id가 새 items.id로 업데이트됨
+     */
+    public function up(): void
+    {
+        // 1. FK 제약조건 삭제 (products 참조)
+        Schema::table('orders', function (Blueprint $table) {
+            // FK 존재 여부 확인 후 삭제
+            $this->dropForeignKeyIfExists($table, 'orders', 'fk_orders_product');
+        });
+
+        Schema::table('order_items', function (Blueprint $table) {
+            $this->dropForeignKeyIfExists($table, 'order_items', 'fk_order_items_product');
+        });
+
+        // 2. FK 제약조건 삭제 (materials 참조)
+        Schema::table('material_receipts', function (Blueprint $table) {
+            $this->dropForeignKeyIfExists($table, 'material_receipts', 'fk_receipts_material_id');
+        });
+
+        Schema::table('lots', function (Blueprint $table) {
+            $this->dropForeignKeyIfExists($table, 'lots', 'fk_lots_material_id');
+        });
+
+        // 3. 관련 테이블 삭제 (종속 테이블 먼저)
+        Schema::dropIfExists('product_components');  // products의 BOM 테이블
+
+        // 4. products 테이블 삭제
+        Schema::dropIfExists('products');
+
+        // 5. materials 테이블 삭제
+        Schema::dropIfExists('materials');
+
+        // 6. 삭제 완료 로그
+        DB::statement("SELECT 'Dropped: products, materials, product_components tables' AS result");
+    }
+
+    /**
+     * 롤백: 테이블 재생성 (데이터 복원 불가)
+     *
+     * 주의: 데이터는 item_id_mappings를 통해 items 테이블에서 복원해야 함
+     */
+    public function down(): void
+    {
+        // products 테이블 재생성
+        if (! Schema::hasTable('products')) {
+            Schema::create('products', function (Blueprint $table) {
+                $table->id();
+                $table->unsignedBigInteger('tenant_id');
+                $table->string('code', 100);
+                $table->string('name', 255);
+                $table->string('unit', 20)->nullable();
+                $table->unsignedBigInteger('category_id')->nullable();
+                $table->enum('type', ['PRODUCT', 'PART', 'SUBASSEMBLY'])->default('PRODUCT');
+                $table->json('attributes')->nullable();
+                $table->json('options')->nullable();
+                $table->text('description')->nullable();
+                $table->boolean('is_active')->default(true);
+                $table->unsignedBigInteger('created_by')->nullable();
+                $table->unsignedBigInteger('updated_by')->nullable();
+                $table->unsignedBigInteger('deleted_by')->nullable();
+                $table->timestamps();
+                $table->softDeletes();
+
+                $table->index(['tenant_id', 'code']);
+                $table->index(['tenant_id', 'type']);
+            });
+        }
+
+        // materials 테이블 재생성
+        if (! Schema::hasTable('materials')) {
+            Schema::create('materials', function (Blueprint $table) {
+                $table->id();
+                $table->unsignedBigInteger('tenant_id');
+                $table->string('code', 100);
+                $table->string('name', 255);
+                $table->string('unit', 20)->nullable();
+                $table->unsignedBigInteger('category_id')->nullable();
+                $table->enum('type', ['SUB_MATERIAL', 'RAW_MATERIAL', 'CONSUMABLE'])->default('SUB_MATERIAL');
+                $table->json('attributes')->nullable();
+                $table->json('options')->nullable();
+                $table->text('description')->nullable();
+                $table->boolean('is_active')->default(true);
+                $table->unsignedBigInteger('created_by')->nullable();
+                $table->unsignedBigInteger('updated_by')->nullable();
+                $table->unsignedBigInteger('deleted_by')->nullable();
+                $table->timestamps();
+                $table->softDeletes();
+
+                $table->index(['tenant_id', 'code']);
+                $table->index(['tenant_id', 'type']);
+            });
+        }
+
+        // product_components 테이블 재생성
+        if (! Schema::hasTable('product_components')) {
+            Schema::create('product_components', function (Blueprint $table) {
+                $table->id();
+                $table->unsignedBigInteger('tenant_id');
+                $table->unsignedBigInteger('product_id');
+                $table->string('ref_type', 20);  // MATERIAL, PRODUCT
+                $table->unsignedBigInteger('ref_id');
+                $table->decimal('quantity', 10, 4)->default(1);
+                $table->string('unit', 20)->nullable();
+                $table->integer('order_no')->default(0);
+                $table->text('note')->nullable();
+                $table->timestamps();
+
+                $table->index(['tenant_id', 'product_id']);
+            });
+        }
+
+        // FK 재생성 (주의: 데이터가 없으면 무결성 오류 가능)
+        // 실제 운영에서는 데이터 복원 후 FK를 별도로 추가해야 함
+        DB::statement("SELECT 'Tables recreated. FK constraints NOT restored. Restore data from items table using item_id_mappings.' AS warning");
+    }
+
+    /**
+     * FK 존재 여부 확인 후 삭제
+     */
+    private function dropForeignKeyIfExists(Blueprint $table, string $tableName, string $fkName): void
+    {
+        $fkExists = DB::select("
+            SELECT COUNT(*) as cnt
+            FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
+            WHERE CONSTRAINT_SCHEMA = ?
+            AND TABLE_NAME = ?
+            AND CONSTRAINT_NAME = ?
+            AND CONSTRAINT_TYPE = 'FOREIGN KEY'
+        ", [config('database.connections.mysql.database'), $tableName, $fkName]);
+
+        if ($fkExists[0]->cnt > 0) {
+            $table->dropForeign($fkName);
+        }
+    }
+};