refactor: Video Chat, Voice Service, Alerts Seiten aus Core Admin entfernt

- Kommunikation-Seiten nach Lehrer migriert
- API-Routes, Health-Check, Navigation bereinigt
- Screen-Flow, SBOM, Tests aktualisiert

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

admin-core/lib/navigation.ts

@@ -36,24 +36,8 @@ export const navigation: NavCategory[] = [
     icon: 'message-circle',
     color: '#22c55e',
     colorClass: 'communication',
-    description: 'Matrix, Jitsi, E-Mail & Alerts',
+    description: 'E-Mail Management',
     modules: [
-      {
-        id: 'video-chat',
-        name: 'Video & Chat',
-        href: '/communication/video-chat',
-        description: 'Matrix & Jitsi Monitoring',
-        purpose: 'Dashboard fuer Matrix Synapse und Jitsi Meet. Service-Status, aktive Meetings, Traffic.',
-        audience: ['Admins', 'DevOps'],
-      },
-      {
-        id: 'matrix',
-        name: 'Voice Service',
-        href: '/communication/matrix',
-        description: 'PersonaPlex-7B & TaskOrchestrator',
-        purpose: 'Voice-First Interface Konfiguration und Architektur-Dokumentation.',
-        audience: ['Entwickler', 'Admins'],
-      },
       {
         id: 'mail',
         name: 'Unified Inbox',
@@ -62,14 +46,6 @@ export const navigation: NavCategory[] = [
         purpose: 'E-Mail-Konten verwalten und KI-Kategorisierung nutzen.',
         audience: ['Support', 'Admins'],
       },
-      {
-        id: 'alerts',
-        name: 'Alerts Monitoring',
-        href: '/communication/alerts',
-        description: 'Google Alerts & Feed-Ueberwachung',
-        purpose: 'Google Alerts und RSS-Feeds fuer relevante Neuigkeiten ueberwachen.',
-        audience: ['Marketing', 'Admins'],
-      },
     ],
   },
   // =========================================================================