onboard-node.sh auto-detects GPU (nvidia-smi/lspci) and SDI capture cards
(blackmagic/deltacast) and computes PROFILES (worker [+gpu] [+capture])
automatically; explicit NODE_ROLE/PROFILES still override. Add Node wizard
drops the role picker — node self-configures from hardware.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Resolves the host's primary LAN address with `ip route get` so the
node-agent reports it in the heartbeat instead of a docker bridge IP.
Adds BMD_MODEL forwarding so the recorder UI knows which card to draw,
and reads back the agent's /health response to confirm the resolved IP.
