feat(observability): add Prometheus/Grafana/Loki/Alertmanager/Alloy stack and remove legacy Monitoring UI

frontend/src/hooks/useDashboard.ts

@@ -5,7 +5,6 @@ import {
 	fetchCounts,
 	fetchDashboardShortcuts,
 	fetchLibraries,
-	fetchMonitoringOverview,
 	saveDashboardShortcut,
 } from "../api/client";
 import type { DashboardShortcutInput } from "../types";
@@ -34,14 +33,6 @@ export function useActivity(machineId?: string) {
 	});
 }
 
-export function useMonitoringOverview() {
-	return useQuery({
-		queryKey: ["dashboard", "monitoring"],
-		queryFn: fetchMonitoringOverview,
-		refetchInterval: 30_000,
-	});
-}
-
 // Backward-compatible alias used by older code.
 export const useNowPlaying = useActivity;