Caddyfile config with shared proxy snippet that sets Host header for
CSRF compatibility. Handles:
- Public domain with auto HTTPS (Let's Encrypt)
- LAN/internal on port 80
- Tor hidden service via localhost:8880
- Yggdrasil IPv6 on port 80
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
