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

check_all_dbs.js

@@ -0,0 +1,17 @@
+const Database = require('better-sqlite3');
+
+function check(path) {
+    try {
+        const db = new Database(path);
+        const tableInfo = db.prepare('PRAGMA table_info(assessment_sessions)').all();
+        console.log(`PATH: ${path}`);
+        console.log(tableInfo.map(c => c.name).join(', '));
+        db.close();
+    } catch (e) {
+        console.log(`PATH: ${path} (ERROR: ${e.message})`);
+    }
+}
+
+check('d:/workspace/AuraK/server/metadata.db');
+check('d:/workspace/AuraK/data/metadata.db');
+check('d:/workspace/AuraK/server/data/metadata.db');