Dutchie Plus Menu API
The core headless-storefront query. `menu(filter, pagination)` returns a retailer's live product catalog - each Product carries brand, category, strainType, description, image, CBD/THC potency, and priced variants (option, priceRec, priceMed, and special prices). Filter by Category and paginate with limit/offset. Confirmed against the official Dutchie Plus Next.js example.