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>

klausur-service/embedding-service/Dockerfile

@@ -0,0 +1,36 @@
+# Embedding Service Dockerfile
+# Handles ML-heavy operations: embeddings, re-ranking, PDF extraction
+
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system dependencies for PDF extraction
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libmagic1 \
+    poppler-utils \
+    tesseract-ocr \
+    tesseract-ocr-deu \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install PyTorch CPU-only (smaller image)
+RUN pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu
+
+# Copy and install requirements
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Note: Models are downloaded on first startup (not during build)
+# This makes the build faster but first startup slower
+# To pre-download models, mount a persistent volume for /root/.cache/huggingface
+
+# Copy application code
+COPY . .
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD python -c "import httpx; httpx.get('http://localhost:8087/health').raise_for_status()"
+
+# Run the service
+EXPOSE 8087
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8087"]