Add managed Deemix MCP integration

platform/mcp/Dockerfile.deemix

@@ -0,0 +1,13 @@
+FROM python:3.13-slim@sha256:ffb752e139c0a19692a43af8d8523b274222dd68eebad5d583b45c2201c6e30a
+
+ARG MCP_VERSION=1.29.0
+RUN pip install --no-cache-dir "mcp==${MCP_VERSION}" \
+    && groupadd --system --gid 10005 deemixmcp \
+    && useradd --system --uid 10005 --gid 10005 --no-create-home deemixmcp
+COPY deemix_mcp.py /app/deemix_mcp.py
+RUN chown -R 10005:10005 /app
+USER 10005:10005
+WORKDIR /app
+ENV PYTHONUNBUFFERED=1
+EXPOSE 8000
+ENTRYPOINT ["python", "/app/deemix_mcp.py"]