Bind navidrome, n8n, immich, openclaw, gitea web ports to 127.0.0.1
to prevent direct LAN access bypassing Caddy/Authelia.
Tailscale userspace networking on Synology proxies through localhost,
so VPS Caddy access via Tailscale IP continues to work.
Gitea SSH port (2222) remains on all interfaces for external git push.