- recorders.js: when isRemote=true, replace MAM_API_URL in sidecar env with
http://<NODE_IP>:<PORT_MAM_API> so capture containers on worker host network
can reach mam-api (fixes assets stuck in live status after recorder stop)
- cluster.js: add GET /api/v1/cluster/metrics endpoint returning per-node
cpu/ram/gpu utilization; update heartbeat handler to persist metrics JSONB
- web-ui: add Resources panel to dashboard with live CPU/RAM/GPU bars per node,
polling /api/v1/cluster/metrics every 5s
