security: bind to 127.0.0.1 by default behind a reverse proxy
New HOST env (default 0.0.0.0 for Docker/back-compat). The VPS installer now
writes HOST=127.0.0.1 and Docker maps the host port to loopback (127.0.0.1:3000:3000)
+ overrides HOST=0.0.0.0 inside the container — so the app is never reachable
directly on its port from the internet, only via the proxy. .env.example defaults
to 127.0.0.1 (manual installs); docs explain it. Existing installs hardened on
re-run of install.sh.
Co-Authored-By: Claude <noreply@…>