HOST_NAME was read but ignored — the FQDN was built from app_name, so 8
apps (vault, cloud, search, notes, social, meet, board, bookmark) routed at
the wrong host and Traefik disagreed with DNS. Build host_setup from
HOST_NAME (falling back to app_name); treat HOST_NAME="@"/"root" as the
domain apex (root-of-domain hosting, previously impossible). Document @ in
the Hostname field tooltip.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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