Add nginx reverse proxy service for Supervisor web UI at supervisor.ai.pivoine.art with Authelia authentication. Proxies to RunPod GPU instance via Tailscale (100.121.199.88:9001). Changes: - Create supervisor-nginx.conf for nginx proxy configuration - Add supervisor service to docker-compose with Traefik labels - Add supervisor.ai.pivoine.art to Authelia protected domains - Remove deprecated Flux-related files 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>