The Proxmox fleet and the operator console must never be publicly reachable. The
primary control is the reverse proxy, but nginx here is a catch-all
(server_name _), so /admin was served on EVERY hostname — a proxy
misconfiguration would expose it. ADMIN_HOSTS pins it; any other host gets 404
(not 403: a public domain must not disclose that a console exists).
Prepended to the group instead of the admin route group on purpose: route
middleware is reordered by Laravel's priority list, which runs first — a
guest would then be redirected to /login and learn the console is there. Covered
by a test for exactly that case. Empty ADMIN_HOSTS = unrestricted, so nobody is
locked out by upgrading.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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