POST /api/gateway/connect dispatches registration + tunnel setup via
systemd-run (same async+state-file+poll idiom as install/update/catalog-
sync), backed by a new `furtka gateway connect-bg` internal CLI
subcommand and furtka.gateway.run_connect()/write_state()/read_state()/
acquire_lock(). GET /api/gateway/status and /api/gateway/connect/status
round out polling; POST /api/gateway/disconnect tears the tunnel down and
deregisters synchronously (a plain HTTP call plus one systemctl action,
same posture as _do_update_settings).
GET/POST /api/apps/<name>/internet is the per-app "expose to internet"
toggle: publishes/unpublishes a route via the connected gateway's
/v1/routes API (furtka.gateway.publish_route/unpublish_route, new) and
tracks published state in paths.internet_routes_file(). Deliberately its
own endpoint rather than a boolean settings[] type — it needs a live
network round-trip and returns a public URL, which the generic settings
modal has no way to express.
_manifest_summary()/cli.py's `app list --json` both gain the internet
field, mechanically identical to how requires was added.