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/src/vision-pipeline/cost-control.module.ts

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { CostControlService } from './cost-control.service';
+import { User } from '../user/user.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([User])],
+  providers: [CostControlService],
+  exports: [CostControlService],
+})
+export class CostControlModule {}