feat: add n8n workflow templates as MCP tools

- Add 4 new MCP tools for workflow templates
- Integrate with n8n.io API to fetch community templates
- Filter templates to last 6 months only
- Store templates in SQLite with full workflow JSON
- Manual fetch system (not part of regular rebuild)
- Support search by nodes, keywords, and task categories
- Add fetch:templates and test:templates npm scripts
- Update to v2.4.1

🤖 Generated with Claude Code

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

src/scripts/fetch-templates.ts

@@ -0,0 +1,75 @@
+#!/usr/bin/env node
+import { createDatabaseAdapter } from '../database/database-adapter';
+import { TemplateService } from '../templates/template-service';
+import * as fs from 'fs';
+import * as path from 'path';
+
+async function fetchTemplates() {
+  console.log('🌐 Fetching n8n workflow templates...\n');
+  
+  // Ensure data directory exists
+  const dataDir = './data';
+  if (!fs.existsSync(dataDir)) {
+    fs.mkdirSync(dataDir, { recursive: true });
+  }
+  
+  // Initialize database
+  const db = await createDatabaseAdapter('./data/nodes.db');
+  
+  // Apply schema if needed
+  const schema = fs.readFileSync(path.join(__dirname, '../../src/database/schema.sql'), 'utf8');
+  db.exec(schema);
+  
+  // Create service
+  const service = new TemplateService(db);
+  
+  // Progress tracking
+  let lastMessage = '';
+  const startTime = Date.now();
+  
+  try {
+    await service.fetchAndUpdateTemplates((message, current, total) => {
+      // Clear previous line
+      if (lastMessage) {
+        process.stdout.write('\r' + ' '.repeat(lastMessage.length) + '\r');
+      }
+      
+      const progress = Math.round((current / total) * 100);
+      lastMessage = `📊 ${message}: ${current}/${total} (${progress}%)`;
+      process.stdout.write(lastMessage);
+    });
+    
+    console.log('\n'); // New line after progress
+    
+    // Get stats
+    const stats = await service.getTemplateStats();
+    const elapsed = Math.round((Date.now() - startTime) / 1000);
+    
+    console.log('✅ Template fetch complete!\n');
+    console.log('📈 Statistics:');
+    console.log(`   - Total templates: ${stats.totalTemplates}`);
+    console.log(`   - Average views: ${stats.averageViews}`);
+    console.log(`   - Time elapsed: ${elapsed} seconds`);
+    console.log('\n🔝 Top used nodes:');
+    
+    stats.topUsedNodes.forEach((node: any, index: number) => {
+      console.log(`   ${index + 1}. ${node.node} (${node.count} templates)`);
+    });
+    
+  } catch (error) {
+    console.error('\n❌ Error fetching templates:', error);
+    process.exit(1);
+  }
+  
+  // Close database
+  if ('close' in db && typeof db.close === 'function') {
+    db.close();
+  }
+}
+
+// Run if called directly
+if (require.main === module) {
+  fetchTemplates().catch(console.error);
+}
+
+export { fetchTemplates };