Add DEMO feature to the project

services/demo_session/Dockerfile

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+# Multi-stage build for Demo Session Service
+FROM python:3.11-slim as builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    g++ \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements and install
+COPY services/demo_session/requirements.txt .
+RUN pip install --no-cache-dir --user -r requirements.txt
+
+# Final stage
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Copy Python dependencies from builder
+COPY --from=builder /root/.local /root/.local
+
+# Copy shared libraries
+COPY shared/ /app/shared/
+
+# Copy service code
+COPY services/demo_session/ /app/
+
+# Copy scripts
+COPY scripts/ /app/scripts/
+
+# Make sure scripts are in path
+ENV PATH=/root/.local/bin:$PATH
+ENV PYTHONPATH=/app:$PYTHONPATH
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
+    CMD python -c "import httpx; httpx.get('http://localhost:8000/health')"
+
+# Run the application
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]