CrystallizeAPI/crystallize-nextjs-boilerplate ? reverse-engineered prompt

Build me a fully working ecommerce storefront in Next.js and React that feels fast and polished, not like a basic shop template.

It should let me showcase rich marketing content alongside product details, with a modern storefront for browsing collections, viewing product pages, and moving items into a basket or checkout flow. Make it easy to connect to a headless backend for product data, content, and ecommerce features, and set it up so I can use either a demo store or my own tenant later.

I also want it ready for good SEO and performance out of the box, with server rendered or edge generated pages where that makes sense, and support for multiple languages if possible. Keep the code organized and easy to extend with reusable components, page specific components, shared UI, and API routes. If anything needs current docs, look them up online and wire it up cleanly.