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>

ai-content-generator/.env.example

@@ -0,0 +1,23 @@
+# Anthropic Claude API
+ANTHROPIC_API_KEY=your-anthropic-api-key-here
+
+# YouTube API (Optional - for enhanced video search)
+# Currently using fallback without API key
+YOUTUBE_API_KEY=
+
+# Service Configuration
+SERVICE_HOST=0.0.0.0
+SERVICE_PORT=8004
+
+# H5P Service Integration
+H5P_SERVICE_URL=http://h5p-service:8080
+
+# Content Service Integration
+CONTENT_SERVICE_URL=http://content-service:8002
+
+# Upload Limits
+MAX_UPLOAD_SIZE=10485760  # 10MB in bytes
+
+# Job Settings
+MAX_CONCURRENT_JOBS=5
+JOB_TIMEOUT=300  # 5 minutes in seconds