Add Claude N8N toolkit with Docker mock API server

- Added comprehensive N8N development tools collection
- Added Docker-containerized mock API server for testing
- Added complete documentation and setup guides
- Added mock API server with health checks and data endpoints
- Tools include workflow analyzers, debuggers, and controllers

🤖 Generated with [Claude Code](https://claude.ai/code)

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

claude_n8n/tools/mock_api_server/Dockerfile

@@ -0,0 +1,24 @@
+FROM python:3.9-slim
+
+WORKDIR /app
+
+# Install dependencies
+RUN pip install flask werkzeug
+
+# Create api_data directory
+RUN mkdir -p api_data
+
+# Copy the mock API server script
+COPY mock_api_server.py .
+
+# Copy API data files if they exist
+COPY api_data/ ./api_data/
+
+# Expose port 5000
+EXPOSE 5000
+
+# Set environment variables
+ENV PYTHONUNBUFFERED=1
+
+# Run the server
+CMD ["python", "mock_api_server.py", "--host", "0.0.0.0", "--port", "5000", "--data-dir", "api_data"]