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

frontend/src/pages/Dashboard.tsx

@@ -26,13 +26,11 @@ import {
 	useActivity,
 	useDashboardShortcuts,
 	useDeleteDashboardShortcut,
-	useMonitoringOverview,
 	useSaveDashboardShortcut,
 } from "../hooks/useDashboard";
 import { useMonitoringSettings } from "../hooks/useSettings";
 import type { DashboardShortcut, DashboardShortcutInput } from "../types";
 import { NowPlaying } from "../components/NowPlaying";
-import { MonitoringOverviewTable } from "../components/MonitoringOverviewTable";
 import { SectionCard } from "../components/SectionCard";
 import { DialogFooter } from "../components/DialogFooter";
 import BackupDashboardWidget from "../components/BackupDashboardWidget";
@@ -325,7 +323,6 @@ export function Dashboard() {
 	const selectedJellyfinId =
 		activeJellyfinMachineId || jellyfinMachines[0]?.id || "";
 	const { data: activity } = useActivity(selectedJellyfinId || undefined);
-	const { data: monitoringOverview } = useMonitoringOverview();
 	const { data: shortcuts = [] } = useDashboardShortcuts();
 	const saveShortcut = useSaveDashboardShortcut();
 	const deleteShortcut = useDeleteDashboardShortcut();
@@ -438,13 +435,6 @@ export function Dashboard() {
 				) : null}
 			</SectionCard>
 
-			<SectionCard
-				title="Monitoring overview"
-				description="10-minute averages and fleet status across all configured machines."
-			>
-				<MonitoringOverviewTable overview={monitoringOverview} embedded />
-			</SectionCard>
-
 			<BackupDashboardWidget />
 
 			<ShortcutDialog