Vercel-only deployment. Backend runs on Vercel Edge Functions under /api/*.
npm i
cp .env.example .env.local
# .env.local
# GROQ_API_KEY=gsk_...
# GROQ_MODEL_ID=llama-3.1-8b-instant
npm run dev
# App: http://localhost:5173
# Health: http://localhost:5173/api/health