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/rag/rag.module.ts

@@ -0,0 +1,21 @@
+import { Module, forwardRef } from '@nestjs/common';
+import { RagService } from './rag.service';
+import { ElasticsearchModule } from '../elasticsearch/elasticsearch.module';
+import { EmbeddingService } from '../knowledge-base/embedding.service';
+import { ModelConfigModule } from '../model-config/model-config.module';
+import { TenantModule } from '../tenant/tenant.module';
+import { UserModule } from '../user/user.module';
+
+import { RerankService } from './rerank.service';
+
+@Module({
+  imports: [
+    forwardRef(() => ElasticsearchModule),
+    ModelConfigModule,
+    TenantModule,
+    UserModule,
+  ],
+  providers: [RagService, EmbeddingService, RerankService],
+  exports: [RagService],
+})
+export class RagModule {}