Refactor to focused n8n node documentation MCP server

Major refactoring to align with actual requirements:
- Purpose: Serve n8n node code/documentation to AI agents only
- No workflow execution or management features
- Complete node information including source code, docs, and examples

New features:
- Node documentation service with SQLite FTS5 search
- Documentation fetcher from n8n-docs repository
- Example workflow generator for each node type
- Simplified MCP tools focused on node information
- Complete database rebuild with all node data

MCP Tools:
- list_nodes: List available nodes
- get_node_info: Get complete node information
- search_nodes: Full-text search across nodes
- get_node_example: Get usage examples
- get_node_source_code: Get source code only
- get_node_documentation: Get documentation only
- rebuild_database: Rebuild entire database
- get_database_statistics: Database stats

Database schema includes:
- Node source code and metadata
- Official documentation from n8n-docs
- Generated usage examples
- Full-text search capabilities
- Category and type filtering

Updated README with:
- Clear purpose statement
- Claude Desktop installation instructions
- Complete tool documentation
- Troubleshooting guide

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

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

package.json

@@ -6,12 +6,16 @@
   "scripts": {
     "build": "tsc",
     "dev": "nodemon --exec ts-node src/index.ts",
+    "dev:v2": "nodemon --exec ts-node src/index-v2.ts",
     "start": "node dist/index.js",
+    "start:v2": "node dist/index-v2.js",
     "test": "jest",
     "lint": "tsc --noEmit",
     "typecheck": "tsc --noEmit",
     "db:rebuild": "node dist/scripts/rebuild-database.js",
-    "db:init": "node -e \"new (require('./dist/services/sqlite-storage-service').SQLiteStorageService)(); console.log('Database initialized')\""
+    "db:rebuild:v2": "node dist/scripts/rebuild-database-v2.js",
+    "db:init": "node -e \"new (require('./dist/services/sqlite-storage-service').SQLiteStorageService)(); console.log('Database initialized')\"",
+    "test:v2": "node tests/test-node-documentation-service.js"
   },
   "repository": {
     "type": "git",