→ Phase 2
• Full-stack web app - Next.js / React, Tanstack, Postgres, Convex
• Auth that works - Clerk, Better-auth, or Supabase Auth
• Stripe live - subscriptions or one-time - with webhook lifecycle.
• 1–4 third-party integrations - email, analytics, AI APIs, etc.
• Staging link by end of week 2, not week 4