feat(dns+ntp): DNS-Cache-Flush + NTP-Force-Sync — operative Aktionen (1.1.94)

Backend: POST /dns/flush-cache (unbound-control flush_zone .)
         POST /ntp/force-sync  (chronyc makestep)
Beide werden im Audit-Log festgehalten.
UI: Schaltflächen in DNS-Settings und NTP-Settings neben Save,
    mit Tooltip-Beschreibung + i18n (de+en).

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

management-ui/src/i18n/locales/de/common.json

@@ -838,7 +838,11 @@
       "rtcsync": "RTC mit System-Time syncen",
       "rtcsyncExtra": "Hardware-Clock alle 11 min synchron halten — nach Reboot ist die Zeit grob korrekt.",
       "leapsectz": "Leap-Sec TZ",
-      "leapsectzExtra": "Optional, z.B. 'right/UTC' für leap-sec über tzdata."
+      "leapsectzExtra": "Optional, z.B. 'right/UTC' für leap-sec über tzdata.",
+      "forceSyncBtn": "Uhr sofort stellen",
+      "forceSyncTooltip": "System-Uhr sofort auf den NTP-Referenzwert setzen (chronyc makestep). Nützlich nach VM-Migration oder längerem Ausfall.",
+      "forceSyncOk": "Uhr erfolgreich gestellt",
+      "forceSyncFailed": "Force-Sync fehlgeschlagen"
     }
   },
   "dns": {
@@ -892,7 +896,11 @@
       "cacheMax": "Cache max-TTL",
       "allIPv4": "alle IPv4-Interfaces",
       "allIPv6": "alle IPv6-Interfaces",
-      "loopback": "Loopback"
+      "loopback": "Loopback",
+      "flushCacheBtn": "DNS-Cache leeren",
+      "flushCacheTooltip": "Alle gecachten Einträge verwerfen (unbound-control flush_zone .). Verwenden wenn DNS-Änderungen sofort greifen sollen.",
+      "flushCacheOk": "DNS-Cache geleert",
+      "flushCacheFailed": "Cache-Flush fehlgeschlagen"
     }
   },
   "fwd": {

management-ui/src/i18n/locales/en/common.json

@@ -838,7 +838,11 @@
       "rtcsync": "Sync RTC with system time",
       "rtcsyncExtra": "Keep hardware clock in sync every 11 min — after reboot time is roughly correct.",
       "leapsectz": "Leap-sec TZ",
-      "leapsectzExtra": "Optional, e.g. 'right/UTC' for leap-sec via tzdata."
+      "leapsectzExtra": "Optional, e.g. 'right/UTC' for leap-sec via tzdata.",
+      "forceSyncBtn": "Force clock step",
+      "forceSyncTooltip": "Immediately step the system clock to the NTP reference (chronyc makestep). Use after VM migration or long outage.",
+      "forceSyncOk": "Clock stepped successfully",
+      "forceSyncFailed": "Force sync failed"
     }
   },
   "dns": {
@@ -892,7 +896,11 @@
       "cacheMax": "Cache max-TTL",
       "allIPv4": "all IPv4 interfaces",
       "allIPv6": "all IPv6 interfaces",
-      "loopback": "Loopback"
+      "loopback": "Loopback",
+      "flushCacheBtn": "Flush DNS cache",
+      "flushCacheTooltip": "Discard all cached records (unbound-control flush_zone .). Use after DNS changes have propagated.",
+      "flushCacheOk": "DNS cache flushed",
+      "flushCacheFailed": "Flush failed"
     }
   },
   "fwd": {

management-ui/src/pages/DNS/index.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react'
 import { Alert, Button, Drawer, Form, Input, InputNumber, Modal, Select, Space, Switch, Tabs, Tag, Tooltip, Typography, message } from 'antd'
 import type { ColumnsType } from 'antd/es/table'
-import { CheckCircleOutlined, CloseCircleOutlined, GlobalOutlined, NodeIndexOutlined, PlusOutlined, SettingOutlined } from '@ant-design/icons'
+import { CheckCircleOutlined, ClearOutlined, CloseCircleOutlined, GlobalOutlined, NodeIndexOutlined, PlusOutlined, SettingOutlined } from '@ant-design/icons'
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useTranslation } from 'react-i18next'
 
@@ -490,6 +490,12 @@ function SettingsTab() {
     onError: (e: Error) => message.error(e.message),
   })
 
+  const flushCache = useMutation({
+    mutationFn: async () => { await apiClient.post('/dns/flush-cache') },
+    onSuccess: () => message.success(t('dns.settings.flushCacheOk')),
+    onError: (e: Error) => message.error(t('dns.settings.flushCacheFailed') + ': ' + e.message),
+  })
+
   if (isLoading) return null
   return (
     <Form
@@ -540,11 +546,22 @@ function SettingsTab() {
         </Form.Item>
       </Space>
       <Form.Item>
-        <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
-          <Button type="primary" htmlType="submit" disabled={isViewer} loading={save.isPending}>
-            {t('common.save')}
-          </Button>
-        </Tooltip>
+        <Space>
+          <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
+            <Button type="primary" htmlType="submit" disabled={isViewer} loading={save.isPending}>
+              {t('common.save')}
+            </Button>
+          </Tooltip>
+          <Tooltip title={t('dns.settings.flushCacheTooltip')}>
+            <Button
+              icon={<ClearOutlined />}
+              loading={flushCache.isPending}
+              onClick={() => flushCache.mutate()}
+            >
+              {t('dns.settings.flushCacheBtn')}
+            </Button>
+          </Tooltip>
+        </Space>
       </Form.Item>
     </Form>
   )

management-ui/src/pages/NTP/index.tsx

@@ -3,7 +3,7 @@ import {
   Alert, Button, Card, Col, Form, Input, InputNumber, Modal, Row, Select, Space, Statistic, Switch, Tabs, Tag, Tooltip, Typography, message,
 } from 'antd'
 import type { ColumnsType } from 'antd/es/table'
-import { CheckCircleOutlined, ClockCircleOutlined, CloseCircleOutlined, DatabaseOutlined, PlusOutlined, ReloadOutlined, SettingOutlined } from '@ant-design/icons'
+import { CheckCircleOutlined, ClockCircleOutlined, CloseCircleOutlined, DatabaseOutlined, PlusOutlined, ReloadOutlined, SettingOutlined, ThunderboltOutlined } from '@ant-design/icons'
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useTranslation } from 'react-i18next'
 
@@ -381,6 +381,12 @@ function SettingsTab() {
     onError: (e: Error) => message.error(e.message),
   })
 
+  const forceSync = useMutation({
+    mutationFn: async () => { await apiClient.post('/ntp/force-sync') },
+    onSuccess: () => message.success(t('ntp.settings.forceSyncOk')),
+    onError: (e: Error) => message.error(t('ntp.settings.forceSyncFailed') + ': ' + e.message),
+  })
+
   if (isLoading) return null
   return (
     <Form
@@ -423,11 +429,22 @@ function SettingsTab() {
         <Input placeholder="right/UTC" allowClear />
       </Form.Item>
       <Form.Item>
-        <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
-          <Button type="primary" htmlType="submit" disabled={isViewer} loading={save.isPending}>
-            {t('common.save')}
-          </Button>
-        </Tooltip>
+        <Space>
+          <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
+            <Button type="primary" htmlType="submit" disabled={isViewer} loading={save.isPending}>
+              {t('common.save')}
+            </Button>
+          </Tooltip>
+          <Tooltip title={t('ntp.settings.forceSyncTooltip')}>
+            <Button
+              icon={<ThunderboltOutlined />}
+              loading={forceSync.isPending}
+              onClick={() => forceSync.mutate()}
+            >
+              {t('ntp.settings.forceSyncBtn')}
+            </Button>
+          </Tooltip>
+        </Space>
       </Form.Item>
     </Form>
   )