Add AUTH_URL for NextAuth v5 compatibility

- NextAuth v5 uses AUTH_URL instead of NEXTAUTH_URL
- Keep both for backward compatibility
- Fixes UntrustedHost error

docker-compose.yml

@@ -8,6 +8,7 @@ services:
     environment:
       - NODE_ENV=production
       - DATABASE_URL=${DATABASE_URL}
+      - AUTH_URL=${AUTH_URL:-http://localhost:3500}
       - NEXTAUTH_URL=${NEXTAUTH_URL:-http://localhost:3500}
       - NEXTAUTH_SECRET=${NEXTAUTH_SECRET}
       - AUTH_SECRET=${AUTH_SECRET}