fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

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

docs/testing/h5p-service-tests.md

@@ -0,0 +1,184 @@
+# H5P Service Tests
+
+## Übersicht
+
+Das H5P Service Modul verfügt über umfassende Integration Tests, die alle Endpoints und Content-Typen validieren.
+
+## Test-Coverage
+
+### Module
+- **Server Endpoints**: Health, Info, Editor Selection
+- **8 Content Type Editors**: Quiz, Video, Presentation, Flashcards, Timeline, Drag & Drop, Fill Blanks, Memory
+- **8 Content Type Players**: Interaktive Player für alle Content-Typen
+- **Static Files**: Korrekte Bereitstellung von Editoren, Players und Assets
+- **Error Handling**: 404-Behandlung für ungültige Routen
+
+## Tests ausführen
+
+### Lokal
+
+```bash
+cd h5p-service
+npm install
+npm test
+```
+
+### Im Docker Container
+
+```bash
+# Service starten
+docker compose -f docker-compose.content.yml up -d h5p-service
+
+# Tests ausführen
+docker compose -f docker-compose.content.yml exec h5p-service npm test
+```
+
+## Test-Dateien
+
+| Datei | Beschreibung |
+|-------|--------------|
+| `h5p-service/tests/server.test.js` | Integration Tests für alle Endpoints |
+| `h5p-service/tests/setup.js` | Jest Test Setup & Configuration |
+| `h5p-service/jest.config.js` | Jest Configuration |
+
+## Coverage Reports
+
+Nach dem Ausführen der Tests:
+
+```bash
+# HTML Report öffnen
+open h5p-service/coverage/lcov-report/index.html
+```
+
+Coverage-Ziel: **>80%**
+
+## Test-Kategorien
+
+### 1. Health & Info Tests
+- Service-Verfügbarkeit
+- Health Check Endpoint
+- Service Info Page
+
+### 2. Editor Selection Tests
+- Alle 8 Content-Typen sichtbar
+- Korrekte Links zu Editoren
+- UI-Elemente vorhanden
+
+### 3. Content Type Tests
+
+Für jeden der 8 Content-Typen:
+- Editor lädt korrekt
+- Player lädt korrekt
+- Erforderliche UI-Elemente vorhanden
+
+**Content-Typen:**
+1. Quiz (Question Set)
+2. Interactive Video
+3. Course Presentation
+4. Flashcards
+5. Timeline
+6. Drag and Drop
+7. Fill in the Blanks
+8. Memory Game
+
+### 4. Static File Tests
+- Core Files erreichbar
+- Editor Files erreichbar
+- Player Files erreichbar
+
+### 5. Error Handling Tests
+- 404 für ungültige Routes
+- Fehlerbehandlung für fehlende Editoren/Players
+
+## CI/CD Integration
+
+Die Tests sind in die CI/CD Pipeline integriert:
+
+```yaml
+# .github/workflows/tests.yml (Beispiel)
+name: H5P Service Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Start H5P Service
+        run: docker compose -f docker-compose.content.yml up -d h5p-service
+
+      - name: Wait for Service
+        run: sleep 10
+
+      - name: Run Tests
+        run: docker compose -f docker-compose.content.yml exec h5p-service npm run test:ci
+
+      - name: Upload Coverage
+        uses: codecov/codecov-action@v3
+        with:
+          files: ./h5p-service/coverage/lcov.info
+```
+
+## Test-Qualität
+
+### Best Practices
+
+1. **Isolation**: Jeder Test ist unabhängig
+2. **Cleanup**: Keine persistenten Änderungen
+3. **Assertions**: Klare Expectations
+4. **Speed**: Tests laufen schnell (<10s gesamt)
+5. **Reliability**: Tests sind deterministisch
+
+### Code Review Checklist
+
+Bei neuen Features:
+- [ ] Tests für neue Endpoints hinzugefügt
+- [ ] Coverage bleibt >80%
+- [ ] Tests sind dokumentiert
+- [ ] CI/CD Tests bestehen
+
+## Troubleshooting
+
+### Tests schlagen fehl
+
+**Service nicht erreichbar:**
+```bash
+# Service Status prüfen
+docker compose -f docker-compose.content.yml ps
+
+# Logs ansehen
+docker compose -f docker-compose.content.yml logs h5p-service
+```
+
+**Port-Konflikte:**
+```bash
+# Prüfe, ob Port 8003 belegt ist
+lsof -i :8003
+
+# Stoppe andere Services
+docker compose -f docker-compose.content.yml down
+```
+
+**Veraltete Dependencies:**
+```bash
+cd h5p-service
+rm -rf node_modules package-lock.json
+npm install
+```
+
+## Zukünftige Erweiterungen
+
+- [ ] E2E Tests mit Playwright
+- [ ] Content Validation Tests
+- [ ] Performance Tests
+- [ ] Security Tests (XSS, CSRF)
+- [ ] Load Tests
+- [ ] Visual Regression Tests
+
+## Verwandte Dokumentation
+
+- [H5P Service README](../../h5p-service/tests/README.md)
+- [Content Service Tests](./content-service-tests.md)
+- [Integration Testing Guide](./integration-testing.md)