[split-required] Split 58 monoliths across Python, Go, TypeScript (Phases 1-3)

Phase 1 — Python (klausur-service): 5 monoliths → 36 files
- dsfa_corpus_ingestion.py (1,828 LOC → 5 files)
- cv_ocr_engines.py (2,102 LOC → 7 files)
- cv_layout.py (3,653 LOC → 10 files)
- vocab_worksheet_api.py (2,783 LOC → 8 files)
- grid_build_core.py (1,958 LOC → 6 files)

Phase 2 — Go (edu-search-service, school-service): 8 monoliths → 19 files
- staff_crawler.go (1,402 → 4), policy/store.go (1,168 → 3)
- policy_handlers.go (700 → 2), repository.go (684 → 2)
- search.go (592 → 2), ai_extraction_handlers.go (554 → 2)
- seed_data.go (591 → 2), grade_service.go (646 → 2)

Phase 3 — TypeScript (admin-lehrer): 45 monoliths → 220+ files
- sdk/types.ts (2,108 → 16 domain files)
- ai/rag/page.tsx (2,686 → 14 files)
- 22 page.tsx files split into _components/ + _hooks/
- 11 component files split into sub-components
- 10 SDK data catalogs added to loc-exceptions
- Deleted dead backup index_original.ts (4,899 LOC)

All original public APIs preserved via re-export facades.
Zero new errors: Python imports verified, Go builds clean,
TypeScript tsc --noEmit shows only pre-existing errors.

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

admin-lehrer/app/(admin)/communication/mail/useMailData.ts

@@ -0,0 +1,61 @@
+'use client'
+
+import { useState, useEffect, useCallback } from 'react'
+import type { EmailAccount, MailStats, SyncStatus } from './types'
+
+export interface UseMailDataReturn {
+  stats: MailStats | null
+  accounts: EmailAccount[]
+  syncStatus: SyncStatus | null
+  loading: boolean
+  error: string | null
+  fetchData: () => Promise<void>
+}
+
+export function useMailData(): UseMailDataReturn {
+  const [stats, setStats] = useState<MailStats | null>(null)
+  const [accounts, setAccounts] = useState<EmailAccount[]>([])
+  const [syncStatus, setSyncStatus] = useState<SyncStatus | null>(null)
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+
+  const fetchData = useCallback(async () => {
+    try {
+      setLoading(true)
+
+      // Fetch stats via our proxy API (avoids CORS/mixed-content issues)
+      const response = await fetch('/api/admin/mail')
+
+      if (response.ok) {
+        const data = await response.json()
+        setStats(data.stats)
+        setAccounts(data.accounts)
+        setSyncStatus(data.syncStatus)
+        setError(null)
+      } else {
+        const errorData = await response.json().catch(() => ({}))
+        throw new Error(errorData.details || `API returned ${response.status}`)
+      }
+    } catch (err) {
+      console.error('Failed to fetch mail data:', err)
+      setError('Verbindung zum Mail-Service (Mailpit) fehlgeschlagen. Laeuft Mailpit auf Port 8025?')
+    } finally {
+      setLoading(false)
+    }
+  }, [])
+
+  useEffect(() => {
+    fetchData()
+
+    // Refresh every 10 seconds if syncing
+    const interval = setInterval(() => {
+      if (syncStatus?.running) {
+        fetchData()
+      }
+    }, 10000)
+
+    return () => clearInterval(interval)
+  }, [fetchData, syncStatus?.running])
+
+  return { stats, accounts, syncStatus, loading, error, fetchData }
+}