67ca0fc3bc
Remove the entire Grafana surface: integrations/grafana.py, GrafanaWidgetSource (+ _fetch_chart, now redundant since prometheus chart exists), GrafanaLinkWidget, LinksTab, get_grafana_status endpoint, useGrafanaStatus hook, GrafanaStatus type, fetchGrafanaStatus client fn, registry/nav/tab entries (FE+BE). Rewrite config.yaml thin-dashboard rule to match reality (recharts is sanctioned for Prometheus-backed series). CHANGELOG migration note added. Backend: 293 pytest pass, ruff clean. Frontend: build+lint green (0 errors). SC-115/116 grep-clean (only prometheus_range.py migration comments + Dashboard.test shortcut fixture remain — both spec-allowed).