feat: add Docker support for cross-platform easy setup

Implements comprehensive Docker support to eliminate Python version and dependency concerns.
Users can now run the MCP server in a container with automatic path translation between
host and container filesystems.

Key features:
- Dockerfile with multi-architecture support (amd64/arm64)
- Automatic path translation using WORKSPACE_ROOT environment variable
- Setup scripts for all platforms (Bash, CMD, PowerShell)
- GitHub Actions workflow for automated Docker Hub publishing
- Secure non-root container execution
- Read-only volume mounts by default

The setup process is now simplified to:
1. Run setup-docker-env script to generate .env and Claude config
2. Build the Docker image
3. Copy generated config to Claude Desktop

No Python installation or virtual environment management required.

Fixes #3

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

Dockerfile

@@ -0,0 +1,29 @@
+# Use Python 3.11 slim image for smaller size and consistent environment
+FROM python:3.11-slim
+
+# Set working directory inside the container
+WORKDIR /app
+
+# Install git (required for some Python packages that may need it)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first to leverage Docker layer caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application
+COPY . .
+
+# Create a non-root user to run the application (security best practice)
+RUN useradd -m -u 1000 mcpuser && \
+    chown -R mcpuser:mcpuser /app
+
+# Switch to non-root user
+USER mcpuser
+
+# Set the entrypoint to run the server
+ENTRYPOINT ["python", "server.py"]