fix: complete Phase 4 integration test fixes

- Fixed better-sqlite3 ES module imports across all tests
- Updated template repository method to handle undefined results
- Fixed all database column references to match schema
- Corrected MCP transport initialization
- All integration tests now passing

src/templates/template-repository.ts

@@ -113,8 +113,8 @@ export class TemplateRepository {
       ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
     `);
     
-    // Extract node types from workflow
-    const nodeTypes = workflow.nodes.map(n => n.name);
+    // Extract node types from workflow detail
+    const nodeTypes = detail.workflow.nodes.map(n => n.type);
     
     // Build URL
     const url = `https://n8n.io/workflows/${workflow.id}`;