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>

src/scripts/rebuild-database-v2.ts

@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+
+import { NodeDocumentationService } from '../services/node-documentation-service';
+import { logger } from '../utils/logger';
+
+async function rebuildDatabase() {
+  console.log('🔄 Starting complete database rebuild...\n');
+  
+  const service = new NodeDocumentationService();
+  
+  try {
+    const startTime = Date.now();
+    
+    console.log('1️⃣ Initializing services...');
+    console.log('2️⃣ Fetching n8n-docs repository...');
+    console.log('3️⃣ Discovering available nodes...');
+    console.log('4️⃣ Extracting node information...\n');
+    
+    const stats = await service.rebuildDatabase();
+    
+    const duration = ((Date.now() - startTime) / 1000).toFixed(2);
+    
+    console.log('\n📊 Rebuild Results:');
+    console.log(`   Total nodes processed: ${stats.total}`);
+    console.log(`   Successfully stored: ${stats.successful}`);
+    console.log(`   Failed: ${stats.failed}`);
+    console.log(`   Duration: ${duration}s`);
+    
+    if (stats.errors.length > 0) {
+      console.log('\n⚠️  First 5 errors:');
+      stats.errors.slice(0, 5).forEach(error => {
+        console.log(`   - ${error}`);
+      });
+      if (stats.errors.length > 5) {
+        console.log(`   ... and ${stats.errors.length - 5} more errors`);
+      }
+    }
+    
+    // Get final statistics
+    const dbStats = service.getStatistics();
+    console.log('\n📈 Database Statistics:');
+    console.log(`   Total nodes: ${dbStats.totalNodes}`);
+    console.log(`   Nodes with documentation: ${dbStats.nodesWithDocs}`);
+    console.log(`   Nodes with examples: ${dbStats.nodesWithExamples}`);
+    console.log(`   Trigger nodes: ${dbStats.triggerNodes}`);
+    console.log(`   Webhook nodes: ${dbStats.webhookNodes}`);
+    console.log(`   Total packages: ${dbStats.totalPackages}`);
+    
+    console.log('\n✨ Database rebuild complete!');
+    
+  } catch (error) {
+    console.error('\n❌ Database rebuild failed:', error);
+    process.exit(1);
+  } finally {
+    service.close();
+  }
+}
+
+// Run if called directly
+if (require.main === module) {
+  rebuildDatabase().catch(error => {
+    console.error(error);
+    process.exit(1);
+  });
+}
+
+export { rebuildDatabase };