feat: Initial NPM MCP server implementation

- NpmClient with JWT auth and auto-refresh
- FastMCP server with 5 tools (list_proxy_hosts, get_proxy_host_details, get_system_health, search_audit_logs, list_certificates)
- Docker support with multi-stage build using uv
- Supports stdio and streamable HTTP transports
- GitHub Actions for tests and Docker builds

Dockerfile

@@ -0,0 +1,40 @@
+# syntax=docker/dockerfile:1
+FROM python:3.13-slim AS builder
+
+WORKDIR /app
+
+# Install uv for fast package installation
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
+
+# Copy project files
+COPY pyproject.toml README.md ./
+COPY src/ src/
+
+# Create virtual environment and install dependencies
+RUN uv venv /app/.venv && \
+    uv pip install --python /app/.venv/bin/python .
+
+# Production image
+FROM python:3.13-slim
+
+WORKDIR /app
+
+# Copy virtual environment from builder
+COPY --from=builder /app/.venv /app/.venv
+
+# Set environment variables
+ENV PATH="/app/.venv/bin:$PATH" \
+    PYTHONUNBUFFERED=1 \
+    NPM_MCP_TRANSPORT=http \
+    NPM_MCP_HOST=0.0.0.0 \
+    NPM_MCP_PORT=8000
+
+# Expose port for HTTP transport
+EXPOSE 8000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import httpx; httpx.get('http://localhost:8000/mcp', timeout=5)" || exit 1
+
+# Run the MCP server
+ENTRYPOINT ["python", "-m", "npm_mcp.main"]