fix: 整合验证修复9个代码缺口 - 历史限制3条、证书公开端点、题库默认DRAFT状态、Admin硬编码

server/src/assessment/entities/question-bank.entity.ts

@@ -50,6 +50,7 @@ export class QuestionBank {
   @Column({
     type: 'simple-enum',
     enum: QuestionBankStatus,
+    default: QuestionBankStatus.DRAFT,
   })
   status: QuestionBankStatus;