Medusa is a strong commerce engine. It owns products, variants, pricing, inventory, carts, orders, and fulfillment, and it exposes all of it through a clean Store API. Once you have the Next.js Starter Storefront running, the commerce half of your site is basically solved. Then marketing asks for a buying guide on every category page, a founder story block on the product detail page, a seasonal landing page that goes live Friday at 9am, and an FAQ section that changes weekly. None of that be...