- Add render.yaml Blueprint: PostgreSQL + Python web service, auto-deploy on push
- Add demo mode (DEMO_MODE, DEMO_USERNAME, DEMO_PASSWORD): single fixed user only
- Login page shows demo credentials when demo mode is active
- Disable self-registration, admin user creation, and OIDC user creation in demo mode
- DB init creates demo user with password when DEMO_MODE is true
- Add docs/deploy/RENDER.md with deployment and demo mode instructions