feat : 테이블 및 DB 마이그레이션 파일 추가

products
  - common_codes
  - parts
  - products
  - files
  - price_histories
  - boms
  - bom_items

  boards
  - boards
  - board_settings
  - posts
  - board_comments
  - board_files
  - post_custom_field_values

  permissions
  - menus
  - roles
  - user_menu_permissions
  - role_menu_permissions

  tenants
  - tenants
  - plans
  - subscriptions
  - payments

database/migrations/2025_07_23_144843_create_subscriptions_table.php

@@ -0,0 +1,25 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void {
+        Schema::create('subscriptions', function (Blueprint $table) {
+            $table->id()->comment('PK');
+            $table->foreignId('tenant_id')->constrained('tenants')->comment('테넌트ID');
+            $table->foreignId('plan_id')->constrained('plans')->comment('플랜ID');
+            $table->date('started_at')->comment('구독 시작일');
+            $table->date('ended_at')->nullable()->comment('구독 종료일(해지시)');
+            $table->string('status', 20)->default('active')->comment('상태(active, canceled, expired 등)');
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void {
+        Schema::dropIfExists('subscriptions');
+    }
+};