feat: implement QuestionBank CRUD with pagination and template query

- Add pagination support to findAll (page, limit query params)
- Add findByTemplateId method to service
- Add GET /by-template/:templateId endpoint to controller
- Service already includes CRUD for QuestionBank and QuestionBankItem

query_columns.js

@@ -0,0 +1,11 @@
+const Database = require('better-sqlite3');
+const db = new Database('d:/workspace/AuraK/server/data/metadata.db');
+
+try {
+    const columns = db.prepare('PRAGMA table_info(assessment_sessions)').all();
+    console.log(columns.map(c => c.name));
+} catch (e) {
+    console.error(e);
+} finally {
+    db.close();
+}