feat(mcp): add Dockerfile for remote streamable-http deployment

surfsense_mcp/.dockerignore

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+.git
+.gitignore
+.venv
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.pytest_cache/
+.ruff_cache/
+.env
+tests/

surfsense_mcp/Dockerfile

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+# syntax=docker.io/docker/dockerfile:1
+# SurfSense MCP Server — remote (streamable-http) image.
+# Serves /mcp (per-request API key, no baked secret) and a public /health probe.
+
+# Stage 1: deps frozen from uv.lock so rebuilds never drift.
+FROM python:3.12-slim AS deps
+
+WORKDIR /app
+
+COPY pyproject.toml uv.lock ./
+RUN pip install --no-cache-dir uv && \
+    uv export --frozen --no-dev --no-emit-project --no-hashes \
+        --format requirements-txt -o /tmp/requirements.txt && \
+    uv pip install --system --no-cache-dir -r /tmp/requirements.txt && \
+    rm /tmp/requirements.txt
+
+
+# Stage 2: project source; --no-deps since deps are already installed above.
+FROM deps AS production
+
+COPY . .
+RUN uv pip install --system --no-cache-dir --no-deps -e .
+
+ENV PYTHONUNBUFFERED=1 \
+    SURFSENSE_MCP_TRANSPORT=streamable-http \
+    SURFSENSE_MCP_HOST=0.0.0.0 \
+    SURFSENSE_MCP_PORT=8080 \
+    SURFSENSE_BASE_URL=https://api.surfsense.com
+
+EXPOSE 8080
+
+CMD ["python", "-m", "surfsense_mcp"]