docs: Add 42 files

squashkiwi-streaming/config/overlay/Dockerfile

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+FROM python:3.11-slim
+
+# Install FFmpeg and fonts
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    ffmpeg \
+    fonts-dejavu-core \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy requirements and install
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application
+COPY overlay_service.py .
+
+# Create recordings directory
+RUN mkdir -p /recordings
+
+# Run as non-root user
+RUN useradd -m -s /bin/bash overlay && \
+    chown -R overlay:overlay /app /recordings
+USER overlay
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import sys; sys.exit(0)"
+
+CMD ["python", "-u", "overlay_service.py"]