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/tsconfig.build.json

@@ -0,0 +1,13 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "incremental": false
+  },
+  "exclude": [
+    "node_modules",
+    "test",
+    "dist",
+    "scripts",
+    "**/*spec.ts"
+  ]
+}