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/assessment/entities/assessment-template.entity.ts

@@ -0,0 +1,105 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+  ManyToOne,
+  JoinColumn,
+} from 'typeorm';
+import { Tenant } from '../../tenant/tenant.entity';
+import { KnowledgeBase } from '../../knowledge-base/knowledge-base.entity';
+import { KnowledgeGroup } from '../../knowledge-group/knowledge-group.entity';
+
+@Entity('assessment_templates')
+export class AssessmentTemplate {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ name: 'tenant_id', nullable: true })
+  tenantId: string;
+
+  @ManyToOne(() => Tenant, { nullable: true, onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'tenant_id' })
+  tenant: Tenant;
+
+  @Column()
+  name: string;
+
+  @Column({ type: 'text', nullable: true })
+  description: string;
+
+  @Column({ type: 'simple-json', nullable: true })
+  keywords: string[];
+
+  @Column({ type: 'int', name: 'question_count', default: 5 })
+  questionCount: number;
+
+  @Column({
+    type: 'simple-json',
+    name: 'difficulty_distribution',
+    nullable: true,
+  })
+  difficultyDistribution: {
+    standard: number;
+    advanced: number;
+    specialist: number;
+  };
+
+  @Column({ type: 'varchar', default: 'technical' })
+  style: string;
+
+  @Column({ name: 'knowledge_base_id', nullable: true })
+  knowledgeBaseId: string | null;
+
+  @ManyToOne(() => KnowledgeBase, { nullable: true })
+  @JoinColumn({ name: 'knowledge_base_id' })
+  knowledgeBase: KnowledgeBase;
+
+  @Column({ name: 'knowledge_group_id', nullable: true })
+  knowledgeGroupId: string | null;
+
+  @ManyToOne(() => KnowledgeGroup, { nullable: true })
+  @JoinColumn({ name: 'knowledge_group_id' })
+  knowledgeGroup: KnowledgeGroup;
+
+  @Column({ type: 'boolean', name: 'is_active', default: true })
+  isActive: boolean;
+
+  @Column({ type: 'int', default: 1 })
+  version: number;
+
+  @Column({ name: 'created_by', nullable: true })
+  createdBy: string;
+
+  @Column({ type: 'simple-json', name: 'linked_group_ids', nullable: true })
+  linkedGroupIds: string[];
+
+  @Column({ type: 'simple-json', name: 'weight_config', nullable: true })
+  weightConfig: {
+    prompt: number;
+    other: number;
+  };
+
+  @Column({ type: 'simple-json', name: 'difficulty_config', nullable: true })
+  difficultyConfig: {
+    standard: number;
+    advanced: number;
+    specialist: number;
+  };
+
+  @Column({ type: 'int', name: 'question_count_min', default: 8 })
+  questionCountMin: number;
+
+  @Column({ type: 'int', name: 'question_count_max', default: 10 })
+  questionCountMax: number;
+
+  @Column({ type: 'int', name: 'passing_score', default: 90 })
+  passingScore: number;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}