fix: resolve database integration test issues

- Fix better-sqlite3 import statements to use namespace import
- Update test schemas to match actual database schema
- Align NodeRepository tests with actual API implementation
- Fix FTS5 tests to work with templates instead of nodes
- Update mock data to match ParsedNode interface
- Fix column names to match actual schema (node_type, package_name, etc)
- Add proper ParsedNode creation helper function
- Remove tests for non-existent foreign key constraints

tests/integration/database/connection-management.test.ts

@@ -311,36 +311,16 @@ describe('Database Connection Management', () => {
       expect(mmap.mmap_size).toBeGreaterThan(0);
     });
 
-    it('should enforce foreign key constraints', async () => {
+    it('should have foreign key support enabled', async () => {
       testDb = new TestDatabase({ mode: 'memory' });
       const db = await testDb.initialize();
 
-      // Foreign keys should be enabled by default in our schema
+      // Foreign keys should be enabled by default
       const fkEnabled = db.prepare('PRAGMA foreign_keys').get() as { foreign_keys: number };
       expect(fkEnabled.foreign_keys).toBe(1);
 
-      // Test foreign key constraint
-      const node = TestDataGenerator.generateNode();
-      db.prepare(`
-        INSERT INTO nodes (name, type, display_name, package, version, type_version, data)
-        VALUES (?, ?, ?, ?, ?, ?, ?)
-      `).run(
-        node.name,
-        node.type,
-        node.displayName,
-        node.package,
-        node.version,
-        node.typeVersion,
-        JSON.stringify(node)
-      );
-
-      // Try to insert doc for non-existent node (should fail)
-      expect(() => {
-        db.prepare(`
-          INSERT INTO node_docs (node_name, content, examples)
-          VALUES ('non-existent-node', 'content', '[]')
-        `).run();
-      }).toThrow(/FOREIGN KEY constraint failed/);
+      // Note: The current schema doesn't define foreign key constraints,
+      // but the setting is enabled for future use
     });
   });
 });