Host-aware routing
Requests for the app subdomain are rewritten to internal product routes, so the app can own `/` on `app.slpcc63.com` without disturbing the marketing homepage.
This scaffold now assumes a single Next.js codebase deployed on Vercel, with the public marketing experience on slpcc63.com and the actual SaaS product on app.slpcc63.com.
Requests for the app subdomain are rewritten to internal product routes, so the app can own `/` on `app.slpcc63.com` without disturbing the marketing homepage.
Marketing and product can share components, auth logic, design tokens, and deployment flow while still feeling like separate surfaces to customers.
Placeholders are ready for auth, Stripe, email, and a database once you pick the services that will back the app.