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/search-history/search-history.entity.ts

@@ -0,0 +1,36 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+  OneToMany,
+} from 'typeorm';
+import { ChatMessage } from './chat-message.entity';
+
+@Entity('search_history')
+export class SearchHistory {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ name: 'user_id' })
+  userId: string;
+
+  @Column({ name: 'tenant_id', nullable: true })
+  tenantId: string;
+
+  @Column()
+  title: string;
+
+  @Column({ name: 'selected_groups', nullable: true })
+  selectedGroups?: string; // JSON string
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+
+  @OneToMany(() => ChatMessage, (message) => message.searchHistory)
+  messages: ChatMessage[];
+}