feat: add ZFS monitoring (#2209)

- track pool capacity, health, I/O, scrub status, and vdev errors
- report dataset usage and correct ZFS filesystem metrics
- add pool charts, detail views, refresh controls, and health alerts
- persist pool details and include ZFS usage in disk alerts
- support configurable detail intervals and legacy agent compatibility

---------

Co-authored-by: hank <hank@henrygd.me>

internal/site/src/components/routes/system/lazy-tables.tsx

@@ -24,6 +24,17 @@ export function LazySmartTable({ systemId }: { systemId: string }) {
 	)
 }
 
+const ZfsTable = lazy(() => import("./zfs-table"))
+
+export function LazyZfsTable({ systemId }: { systemId: string }) {
+	const { isIntersecting, ref } = useIntersectionObserver({ rootMargin: "90px" })
+	return (
+		<div ref={ref} className={cn(isIntersecting && "contents")}>
+			{isIntersecting && <ZfsTable systemId={systemId} />}
+		</div>
+	)
+}
+
 const SystemdTable = lazy(() => import("../../systemd-table/systemd-table"))
 
 export function LazySystemdTable({ systemId }: { systemId: string }) {