Add Dockerfile (stdio, python-slim); trim requirements to runtime deps

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,12 @@
+# syntax=docker/dockerfile:1
+
+FROM docker.io/library/python:3.12-slim
+LABEL org.opencontainers.image.title="calcmcp" \
+      org.opencontainers.image.description="Scientific calculator MCP server (SymPy/NumPy/SciPy/pandas), stdio transport" \
+      org.opencontainers.image.source="https://mysources.co.uk/michal/CalcMCP"
+WORKDIR /app
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+COPY calculator.py mcp_server.py ./
+USER nobody
+ENTRYPOINT ["python", "-u", "mcp_server.py"]

requirements.txt

@@ -1,8 +1,4 @@
-Flask>=3.0.0
-Flask-CORS>=4.0.0
-requests>=2.31.0
-fastmcp>=0.1.0
 sympy>=1.12
-scipy>=1.11.0
 numpy>=1.24.0
-pytest>=7.0.0
+scipy>=1.11.0
+pandas>=2.0.0