fix: language toggle uses cookie instead of URL routing

fix: remove middleware for simpler i18n setup

fix: move @import fonts to top of CSS file

feat(payments): create checkout page and Lightning invoice API

feat(landing): create Neo-Brutalist landing page with Hero and Products sections

feat(product): create ProductCard and ProductDetail components

feat(layout): create Header, Footer, ThemeToggle, LanguageToggle, CartButton, CartDrawer

feat(design): configure Neo-Brutalist design system with Tailwind

feat(arch): define project architecture and TypeScript interfaces

feat: initialize Next.js 15 project with core dependencies

chore: initial commit with project base and MCP config