Revert the /grafana/ nginx sub-path I wrongly added — it broke the existing
http://192.168.68.116:3001/d/gpu-fleet URL. Restored direct 0.0.0.0:3001 LAN
access. Contract is now the source of truth: no GF_SERVER_SERVE_FROM_SUB_PATH,
no nginx /grafana/ route. gpu-fleet + 3 new dashboards all at :3001.