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/model-config/model-config.module.ts

@@ -0,0 +1,17 @@
+import { Module, forwardRef } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { ModelConfig } from './model-config.entity';
+import { ModelConfigService } from './model-config.service';
+import { ModelConfigController } from './model-config.controller';
+import { TenantModule } from '../tenant/tenant.module';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([ModelConfig]),
+    forwardRef(() => TenantModule),
+  ],
+  providers: [ModelConfigService],
+  controllers: [ModelConfigController],
+  exports: [ModelConfigService],
+})
+export class ModelConfigModule {}