feat: add subscription service — user auth, Stripe billing, API keys, dashboard

- NextAuth v5 with email+password credentials, JWT sessions
- Registration, login, email verification, password reset flows
- Stripe integration: Free (15/day), Starter ($5/1k/mo), Pro ($20/100k/mo)
- API key management (cb_ prefix) with hash-based validation
- Dashboard with generations history, settings, billing management
- Rate limiting: Redis daily counter (free), DB monthly (paid)
- Generate route auth: Bearer API key + session, anonymous allowed
- Worker userId propagation for generation history
- Pricing section on landing page, auth-aware navbar
- Middleware with route protection, CORS for codeboard.vectry.tech
- Docker env vars for auth, Stripe, email (smtp.migadu.com)

docker-compose.yml

@@ -8,6 +8,19 @@ services:
     environment:
       - REDIS_URL=redis://redis:6379
       - DATABASE_URL=postgresql://codeboard:codeboard@postgres:5432/codeboard
+      - AUTH_SECRET=${AUTH_SECRET:-}
+      - AUTH_URL=https://codeboard.vectry.tech
+      - STRIPE_SECRET_KEY=${STRIPE_SECRET_KEY:-}
+      - STRIPE_WEBHOOK_SECRET=${STRIPE_WEBHOOK_SECRET:-}
+      - STRIPE_STARTER_PRICE_ID=price_1SzMQbR8i0An4Wz70Elgk5Zd
+      - STRIPE_PRO_PRICE_ID=price_1SzMQrR8i0An4Wz7UseMs0yy
+      - EMAIL_FROM=CodeBoard <noreply@vectry.tech>
+      - EMAIL_HOST=smtp.migadu.com
+      - EMAIL_PORT=465
+      - EMAIL_SECURE=true
+      - EMAIL_USER=hunter@repi.fun
+      - EMAIL_PASSWORD=${EMAIL_PASSWORD:-}
+      - NEXT_PUBLIC_APP_URL=https://codeboard.vectry.tech
     depends_on:
       redis:
         condition: service_started