[split-required] Split 500-1000 LOC files across all services

backend-lehrer (5 files):
- alerts_agent/db/repository.py (992 → 5), abitur_docs_api.py (956 → 3)
- teacher_dashboard_api.py (951 → 3), services/pdf_service.py (916 → 3)
- mail/mail_db.py (987 → 6)

klausur-service (5 files):
- legal_templates_ingestion.py (942 → 3), ocr_pipeline_postprocess.py (929 → 4)
- ocr_pipeline_words.py (876 → 3), ocr_pipeline_ocr_merge.py (616 → 2)
- KorrekturPage.tsx (956 → 6)

website (5 pages):
- mail (985 → 9), edu-search (958 → 8), mac-mini (950 → 7)
- ocr-labeling (946 → 7), audit-workspace (871 → 4)

studio-v2 (5 files + 1 deleted):
- page.tsx (946 → 5), MessagesContext.tsx (925 → 4)
- korrektur (914 → 6), worksheet-cleanup (899 → 6)
- useVocabWorksheet.ts (888 → 3)
- Deleted dead page-original.tsx (934 LOC)

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

studio-v2/app/_components/DocumentsTab.tsx

@@ -0,0 +1,91 @@
+'use client'
+
+import { useTheme } from '@/lib/ThemeContext'
+import { DocumentSpace } from '@/components/DocumentSpace'
+
+interface StoredDocument {
+  id: string
+  name: string
+  type: string
+  size: number
+  uploadedAt: Date
+  url?: string
+}
+
+interface DocumentsTabProps {
+  documents: StoredDocument[]
+  onDelete: (id: string) => void
+  onRename: (id: string, newName: string) => void
+  setShowUploadModal: (show: boolean) => void
+  setShowQRModal: (show: boolean) => void
+}
+
+export function DocumentsTab({ documents, onDelete, onRename, setShowUploadModal, setShowQRModal }: DocumentsTabProps) {
+  const { isDark } = useTheme()
+
+  return (
+    <div className="space-y-6">
+      {/* Upload-Optionen */}
+      <div className="grid grid-cols-2 gap-6">
+        <button
+          onClick={() => setShowUploadModal(true)}
+          className={`p-6 rounded-3xl border backdrop-blur-xl text-left transition-all hover:scale-105 ${
+            isDark
+              ? 'bg-white/10 border-white/20 hover:bg-white/15'
+              : 'bg-white/70 border-black/10 hover:bg-white/90 shadow-lg'
+          }`}
+        >
+          <div className={`w-14 h-14 rounded-2xl flex items-center justify-center text-3xl mb-4 ${
+            isDark ? 'bg-blue-500/20' : 'bg-blue-100'
+          }`}>
+            📤
+          </div>
+          <h3 className={`text-lg font-semibold mb-2 ${isDark ? 'text-white' : 'text-slate-900'}`}>
+            Direkt hochladen
+          </h3>
+          <p className={`text-sm ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
+            Ziehen Sie Dateien hierher oder klicken Sie zum Auswaehlen
+          </p>
+        </button>
+
+        <button
+          onClick={() => setShowQRModal(true)}
+          className={`p-6 rounded-3xl border backdrop-blur-xl text-left transition-all hover:scale-105 ${
+            isDark
+              ? 'bg-white/10 border-white/20 hover:bg-white/15'
+              : 'bg-white/70 border-black/10 hover:bg-white/90 shadow-lg'
+          }`}
+        >
+          <div className={`w-14 h-14 rounded-2xl flex items-center justify-center text-3xl mb-4 ${
+            isDark ? 'bg-purple-500/20' : 'bg-purple-100'
+          }`}>
+            📱
+          </div>
+          <h3 className={`text-lg font-semibold mb-2 ${isDark ? 'text-white' : 'text-slate-900'}`}>
+            Mit Mobiltelefon hochladen
+          </h3>
+          <p className={`text-sm ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
+            QR-Code scannen (nur im lokalen Netzwerk)
+          </p>
+        </button>
+      </div>
+
+      {/* Document Space */}
+      <div className={`rounded-3xl border backdrop-blur-xl p-6 ${
+        isDark
+          ? 'bg-white/10 border-white/20'
+          : 'bg-white/70 border-black/10 shadow-lg'
+      }`}>
+        <h2 className={`text-xl font-semibold mb-6 ${isDark ? 'text-white' : 'text-slate-900'}`}>
+          Meine Dokumente
+        </h2>
+        <DocumentSpace
+          documents={documents}
+          onDelete={onDelete}
+          onRename={onRename}
+          onOpen={(doc) => doc.url && window.open(doc.url, '_blank')}
+        />
+      </div>
+    </div>
+  )
+}