fix: 智能出题限制总题数 20 以内

src/main/java/cn/com/poc/writing/rest/impl/ExaminationRestImpl.java

@@ -51,6 +51,7 @@ public class ExaminationRestImpl implements ExaminationRest {
 //        Assert.notBlank(generateExaminationDto.getPositions());
         Assert.notEmpty(generateExaminationDto.getQuestionType());
         Assert.notNull(generateExaminationDto.getN());
+        Assert.isTrue(generateExaminationDto.getN() <= 20,"总题数不可大于20题");
 
         UserBaseEntity currentUser = BlContext.getCurrentUser();
         GenerateExaminationEntity generateExaminationEntity = new GenerateExaminationEntity();