[split-required] Split remaining 500-680 LOC files (final batch)

website (17 pages + 3 components):
- multiplayer/wizard, middleware/wizard+test-wizard, communication
- builds/wizard, staff-search, voice, sbom/wizard
- foerderantrag, mail/tasks, tools/communication, sbom
- compliance/evidence, uni-crawler, brandbook (already done)
- CollectionsTab, IngestionTab, RiskHeatmap

backend-lehrer (5 files):
- letters_api (641 → 2), certificates_api (636 → 2)
- alerts_agent/db/models (636 → 3)
- llm_gateway/communication_service (614 → 2)
- game/database already done in prior batch

klausur-service (2 files):
- hybrid_vocab_extractor (664 → 2)
- klausur-service/frontend: api.ts (620 → 3), EHUploadWizard (591 → 2)

voice-service (3 files):
- bqas/rag_judge (618 → 3), runner (529 → 2)
- enhanced_task_orchestrator (519 → 2)

studio-v2 (6 files):
- korrektur/[klausurId] (578 → 4), fairness (569 → 2)
- AlertsWizard (552 → 2), OnboardingWizard (513 → 2)
- korrektur/api.ts (506 → 3), geo-lernwelt (501 → 2)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

website/app/admin/communication/_components/useCommunicationStats.ts

@@ -0,0 +1,66 @@
+'use client'
+
+import { useState, useEffect, useCallback } from 'react'
+import { CommunicationStats, ActiveMeeting, RecentRoom } from './types'
+
+const API_BASE = '/api/admin/communication'
+
+export function useCommunicationStats() {
+  const [stats, setStats] = useState<CommunicationStats | null>(null)
+  const [activeMeetings, setActiveMeetings] = useState<ActiveMeeting[]>([])
+  const [recentRooms, setRecentRooms] = useState<RecentRoom[]>([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+
+  const fetchStats = useCallback(async () => {
+    try {
+      const response = await fetch(`${API_BASE}/stats`)
+      if (!response.ok) {
+        throw new Error(`HTTP ${response.status}`)
+      }
+      const data = await response.json()
+      setStats(data)
+      setActiveMeetings(data.active_meetings || [])
+      setRecentRooms(data.recent_rooms || [])
+      setError(null)
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Verbindungsfehler')
+      // Set mock data for display purposes when API unavailable
+      setStats({
+        matrix: {
+          total_users: 0,
+          active_users: 0,
+          total_rooms: 0,
+          active_rooms: 0,
+          messages_today: 0,
+          messages_this_week: 0,
+          status: 'offline'
+        },
+        jitsi: {
+          active_meetings: 0,
+          total_participants: 0,
+          meetings_today: 0,
+          average_duration_minutes: 0,
+          peak_concurrent_users: 0,
+          total_minutes_today: 0,
+          status: 'offline'
+        },
+        last_updated: new Date().toISOString()
+      })
+    } finally {
+      setLoading(false)
+    }
+  }, [])
+
+  useEffect(() => {
+    fetchStats()
+  }, [fetchStats])
+
+  // Auto-refresh every 15 seconds
+  useEffect(() => {
+    const interval = setInterval(fetchStats, 15000)
+    return () => clearInterval(interval)
+  }, [fetchStats])
+
+  return { stats, activeMeetings, recentRooms, loading, error, fetchStats }
+}