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

server/check_db.js

@@ -0,0 +1,13 @@
+const Database = require('better-sqlite3');
+const db = new Database('./data/metadata.db');
+
+const tables = db.prepare("SELECT name FROM sqlite_master WHERE type='table'").all();
+console.log('Tables:', tables.map(t => t.name));
+
+const models = db.prepare("SELECT id, name, modelId, baseUrl, apiKey, isEnabled FROM model_config").all();
+console.log('Models:', JSON.stringify(models, null, 2));
+
+const settings = db.prepare("SELECT tenantId, selectedLLMId FROM tenant_settings").all();
+console.log('Settings:', JSON.stringify(settings, null, 2));
+
+db.close();