The previous commit used `hbbs -R 192.168.1.69` (uppercase -R sets
rendezvous/cluster servers), so hbbs advertised an empty relay list and
clients failed with "failed to connect to relay server". Lowercase -r is
the relay-server flag; hbbs now advertises 192.168.1.69 and LAN clients
relay correctly.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>