Implement n8n-MCP integration

This commit adds a complete integration between n8n workflow automation and the Model Context Protocol (MCP):

Features:
- MCP server that exposes n8n workflows as tools, resources, and prompts
- Custom n8n node for connecting to MCP servers from workflows
- Bidirectional bridge for data format conversion
- Token-based authentication and credential management
- Comprehensive error handling and logging
- Full test coverage for core components

Infrastructure:
- TypeScript/Node.js project setup with proper build configuration
- Docker support with multi-stage builds
- Development and production docker-compose configurations
- Installation script for n8n custom node deployment

Documentation:
- Detailed README with usage examples and API reference
- Environment configuration templates
- Troubleshooting guide

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

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

docker-compose.dev.yml

@@ -0,0 +1,32 @@
+version: '3.8'
+
+services:
+  n8n:
+    image: n8nio/n8n:latest
+    container_name: n8n-dev
+    restart: unless-stopped
+    ports:
+      - "5678:5678"
+    environment:
+      - N8N_BASIC_AUTH_ACTIVE=false
+      - N8N_HOST=localhost
+      - N8N_PORT=5678
+      - N8N_PROTOCOL=http
+      - NODE_ENV=development
+      - WEBHOOK_URL=http://localhost:5678/
+      - GENERIC_TIMEZONE=UTC
+      # Enable API for MCP integration
+      - N8N_USER_MANAGEMENT_DISABLED=true
+      - N8N_PUBLIC_API_DISABLED=false
+    volumes:
+      - n8n_data:/home/node/.n8n
+      - ./dist/n8n:/home/node/.n8n/custom/nodes
+    networks:
+      - n8n-network
+
+networks:
+  n8n-network:
+    driver: bridge
+
+volumes:
+  n8n_data: