feat(dashboard): vervang SECTIONS-grid door 5 live status-widgets

Parallel server-side fetches via Promise.allSettled voor Docker, Caddy,
systemd, Git en Audit. Iedere widget toont geaggregeerde status en
refresht elke 30s client-side onafhankelijk van de andere widgets.

- lib/agent-fetch.ts: gedeelde client-side streaming helper
- app/api/audit/latest/route.ts: GET endpoint voor AuditWidget refresh
- app/_components/DockerWidget.tsx: running/total containers
- app/_components/CaddyWidget.tsx: soonest cert expiry in dagen
- app/_components/SystemdWidget.tsx: healthy/total units (of niet geconfigureerd)
- app/_components/GitWidget.tsx: dirty repo count (of niet geconfigureerd)
- app/_components/AuditWidget.tsx: laatste FlowRun status + relatief tijdstip
- app/page.tsx: vervangt SECTIONS-grid, doet parallel fetches, rendert widgets

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/_components/DockerWidget.tsx

@@ -0,0 +1,54 @@
+'use client'
+
+import { useCallback, useEffect, useState } from 'react'
+import Link from 'next/link'
+import { parseDockerPs } from '@/lib/parse-docker'
+import { fetchAgentOutput } from '@/lib/agent-fetch'
+
+type DockerData = { running: number; total: number }
+export type DockerInitial = { data: DockerData; error: null } | { data: null; error: string }
+
+async function refreshDocker(): Promise<DockerData> {
+  const output = await fetchAgentOutput('docker_ps')
+  const containers = parseDockerPs(output)
+  return {
+    running: containers.filter((c) => c.status.toLowerCase().startsWith('up')).length,
+    total: containers.length,
+  }
+}
+
+export default function DockerWidget({ initial }: { initial: DockerInitial }) {
+  const [data, setData] = useState<DockerData | null>(initial.data)
+  const [error, setError] = useState<string | null>(initial.error)
+
+  const refresh = useCallback(async () => {
+    try {
+      const d = await refreshDocker()
+      setData(d)
+      setError(null)
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'refresh failed')
+    }
+  }, [])
+
+  useEffect(() => {
+    const id = setInterval(refresh, 30_000)
+    return () => clearInterval(id)
+  }, [refresh])
+
+  return (
+    <Link href="/docker" className="block rounded-lg border bg-card p-5 transition-colors hover:bg-accent">
+      <h2 className="text-sm font-medium text-muted-foreground">Docker</h2>
+      {error ? (
+        <p className="mt-2 text-sm text-destructive truncate">{error}</p>
+      ) : data ? (
+        <p className="mt-2 text-2xl font-semibold">
+          {data.running}
+          <span className="text-sm font-normal text-muted-foreground"> / {data.total} running</span>
+        </p>
+      ) : (
+        <p className="mt-2 text-sm text-muted-foreground">—</p>
+      )}
+    </Link>
+  )
+}