- Add Plan, Subscription, Payment, PaymentMethod, Coupon models - Add ApiKey, Webhook models for API access - Add AppConfig model for dynamic configuration - Add role, suspendedAt fields to User model - Create comprehensive seeder with: - Admin user (dwindi.ramadhana@gmail.com) - Default plans (Free, Pro Monthly, Pro Yearly) - Payment methods (BCA, Mandiri, GoPay) - App config (maintenance mode) - Zero data loss migration strategy