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>

backend/Dockerfile.worker

@@ -0,0 +1,49 @@
+# BreakPilot Transcription Worker
+# GPU-optimized container for faster-whisper + pyannote.audio
+#
+# Build: docker build -f Dockerfile.worker -t breakpilot-transcription-worker .
+# Run:   docker run --gpus all breakpilot-transcription-worker
+
+FROM python:3.11-slim
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    libsndfile1 \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create app user (non-root)
+RUN useradd --create-home --shell /bin/bash worker
+WORKDIR /app
+
+# Install Python dependencies for transcription
+COPY requirements-worker.txt .
+RUN pip install --no-cache-dir -r requirements-worker.txt
+
+# Copy worker package
+COPY transcription_worker/ ./transcription_worker/
+
+# Change ownership
+RUN chown -R worker:worker /app
+
+# Switch to non-root user
+USER worker
+
+# Create cache directories
+RUN mkdir -p /home/worker/.cache/huggingface \
+    && mkdir -p /tmp/transcriptions
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD python -c "from transcription_worker.transcriber import WhisperTranscriber; print('OK')" || exit 1
+
+# Entry point - RQ worker
+CMD ["python", "-m", "transcription_worker.worker"]