feat: umfangreiches UI+API-Polish (v1.1.36–1.1.42)

Backend:
- Audit-Log: Search-Endpoint mit ILIKE-Filter (actor/action/subject/date)
- NTP: /ntp/status via chronyc tracking (Stratum, Offset, Quelle)
- System: /service-restart mit Allowlist (haproxy/squid/unbound/chrony/scheduler)
- Domain-Response-Headers + Rate-Limit (Migration 0024)
- Join-Tokens (Migration 0025), Cluster-mTLS, Aggregator-Fan-Out
- apt-Service für Update-Banner (apt-get update + Versionsprüfung)
- Backup-Retry mit exponential backoff (retry_apt 3×)
- publish.sh fail-fast + cleanup-old.sh (max 10 Versionen)

Frontend:
- Audit-Log-Page (/audit) mit Filter + Pagination
- ErrorBoundary an React-Root + Vite build-target festgenagelt (iOS 15+)
- Storage-Schema-Stamp: auto-wipe bei Versions-Mismatch (blank-page-Fix)
- EmptyState-Komponente überall ausgerollt
- SSL: Aggregate-Karte (total/expiring/expired/errors)
- Backups: Aggregate-Karte (letzter Backup/Größe/Fehlschläge 24h) + Backup-Now
- NTP: Sync-Status-Karte (chronyc tracking live)
- Domains: Backend-UP/DOWN-Chip aus HAProxy-Stats
- Backends: HAProxy-Status-Spalte (UP/DEGRADED/DOWN)
- Settings: Service-Neustart-Karte (haproxy/squid/unbound/chrony/scheduler)
- Settings: Upgrade-Status-Card, Wartungsmodus, Auto-Update, Retention
- Dashboard: Recent-Alerts, Cluster-Health, License-Chip, Onboarding-Hint
- System-Regeln im Firewall als eigener Tab

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

management-ui/src/pages/Networks/Routes.tsx

@@ -10,6 +10,7 @@ import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useTranslation } from 'react-i18next'
 
 import apiClient, { isEnvelope } from '../../api/client'
+import EmptyState from '../../components/EmptyState'
 
 const { Text } = Typography
 
@@ -168,6 +169,14 @@ export default function RoutesTab() {
       render: (v?: number) => v ?? '—' },
   ]
 
+  const openCreate = () => {
+    setCreating(true); form.resetFields()
+    form.setFieldsValue({
+      metric: 100, table_name: 'main', active: true,
+      destination: '', gateway: '', dev: '',
+    })
+  }
+
   return (
     <div>
       <Card
@@ -207,13 +216,7 @@ export default function RoutesTab() {
         title={t('routes.managedTitle')}
         extra={
           <Button type="primary" size="small" icon={<PlusOutlined />}
-            onClick={() => {
-              setCreating(true); form.resetFields()
-              form.setFieldsValue({
-                metric: 100, table_name: 'main', active: true,
-                destination: '', gateway: '', dev: '',
-              })
-            }}>
+            onClick={openCreate}>
             {t('routes.add')}
           </Button>
         }
@@ -226,7 +229,18 @@ export default function RoutesTab() {
           dataSource={managed.data ?? []}
           columns={managedColumns}
           pagination={false}
-          locale={{ emptyText: t('routes.empty') }}
+          locale={{ emptyText: (
+            <EmptyState
+              icon={<EnvironmentOutlined />}
+              title={t('routes.emptyTitle')}
+              description={t('routes.emptyDesc')}
+              action={
+                <Button type="primary" icon={<PlusOutlined />} onClick={openCreate}>
+                  {t('routes.add')}
+                </Button>
+              }
+            />
+          ) }}
           style={{ marginTop: 12 }}
         />
       </Card>