fix(settings): Bestätigungsdialog vor Service-Restart + status-dot CSS (v1.1.138)

- Popconfirm vor jedem Restart-Button — kein versehentlicher Neustart mehr
- status-dot inline styles → .status-dot.online/.offline CSS-Klassen

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

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

@@ -565,6 +565,9 @@
     "backupNowBtn": "Backup now",
     "serviceRestartCardTitle": "Restart services",
     "serviceRestartBtn": "Restart",
+    "serviceRestartConfirmTitle": "Restart {{service}}?",
+    "serviceRestartConfirmDesc": "The service will be briefly unavailable while restarting.",
+    "serviceRestartConfirmOk": "Yes, restart",
     "serviceRestartOk": "{{service}} restarted successfully.",
     "serviceRestartFailed": "Restart of {{service}} failed",
     "serviceRestartHint": "Restarts the service via systemctl restart. edgeguard-api and PostgreSQL are intentionally excluded.",