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/feishu/dto/bind-bot.dto.ts

@@ -0,0 +1,11 @@
+import { IsString, IsNotEmpty, IsUUID } from 'class-validator';
+
+export class BindFeishuBotDto {
+  @IsUUID()
+  @IsNotEmpty()
+  botId: string;
+
+  @IsString()
+  @IsNotEmpty()
+  verificationCode?: string; // Optional: used to validate the binding relationship
+}