Add read-only STRATO DNS MCP prototype

Dockerfile

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+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 10009 stratomcp \
+    && useradd --system --uid 10009 --gid 10009 --no-create-home stratomcp
+
+COPY strato_client.py /app/strato_client.py
+COPY strato_mcp.py /app/strato_mcp.py
+
+USER 10009:10009
+WORKDIR /app
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    MCP_TRANSPORT=streamable-http \
+    PORT=8000
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 \
+  CMD python -c "import socket; s=socket.create_connection(('127.0.0.1',8000),3); s.close()"
+
+ENTRYPOINT ["python", "/app/strato_mcp.py"]