The static per-app CFG_<APP>_HOST_NAME is gone. host_setup (the app's
canonical FQDN, feeding the legacy single DOMAINSUBNAME_DATA used by app env
vars, the app URL and trusted-domains) is now derived from the app's primary
Traefik port's subdomain: first recommended port, else first Traefik port;
@/root -> apex, set -> sub.domain, empty -> app-name. Removes HOST_NAME from
all app configs, the config-form field mapping (Hostname), the dead
headscale stub, and wireguard.sh (now uses host_setup). Completes the move to
dynamic per-port subdomain routing.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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