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>

package.json

@@ -0,0 +1,42 @@
+{
+  "name": "n8n-mcp",
+  "version": "1.0.0",
+  "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "tsc",
+    "dev": "nodemon --exec ts-node src/index.ts",
+    "start": "node dist/index.js",
+    "test": "jest",
+    "lint": "tsc --noEmit",
+    "typecheck": "tsc --noEmit"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/czlonkowski/n8n-mcp.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/czlonkowski/n8n-mcp/issues"
+  },
+  "homepage": "https://github.com/czlonkowski/n8n-mcp#readme",
+  "devDependencies": {
+    "@types/express": "^5.0.3",
+    "@types/jest": "^29.5.14",
+    "@types/node": "^22.15.30",
+    "jest": "^29.7.0",
+    "nodemon": "^3.1.10",
+    "ts-jest": "^29.3.4",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.8.3"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.12.1",
+    "dotenv": "^16.5.0",
+    "express": "^5.1.0",
+    "n8n-core": "^1.14.1",
+    "n8n-workflow": "^1.82.0"
+  }
+}