fix : 모델, BOM 구성 수정

- 설계용 모델, BOM 기능 추가

database/migrations/2025_09_05_000001_create_models_table.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    // 설계 상위: models
+    public function up(): void {
+        Schema::create('models', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->unsignedBigInteger('tenant_id')->comment('테넌트ID');
+            $table->string('code', 100)->comment('모델코드(설계코드)');
+            $table->string('name', 200)->comment('모델명');
+            $table->unsignedBigInteger('category_id')->nullable()->comment('카테고리ID(참조용, FK 미설정)');
+            $table->string('lifecycle', 30)->nullable()->comment('PLANNING/ACTIVE/DEPRECATED 등');
+            $table->text('description')->nullable();
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+            $table->softDeletes();
+
+            $table->unique(['tenant_id', 'code'], 'uq_models_tenant_code');
+            $table->index(['tenant_id', 'is_active'], 'idx_models_tenant_active');
+            $table->index(['tenant_id', 'category_id'], 'idx_models_tenant_category');
+        });
+    }
+
+    public function down(): void {
+        Schema::dropIfExists('models');
+    }
+};