feat: add Authelia SSO authentication service
- Add Authelia service to NET stack for centralized SSO
- Create configuration.yml with PostgreSQL storage
- Create users_database.yml for file-based user management
- Add authelia database to PostgreSQL init script
- Configure Traefik ForwardAuth middleware
- Add environment variables to arty.yml
- Supports TOTP and WebAuthn 2FA
- Email notifications via Mailpit SMTP relay
- Protected services: netdata, mailpit, scrapy, restic, traefik, dev, n8n, asciinema, coolify
Sebastian Krüger
f9c953ecbc