fix: 添加试卷编号为行号问题

smart-steward-service/src/main/java/com/smartSteward/service/exam/impl/ExamPaperServiceImpl.java

                                QuestionTypes.FILL_BLANK.getCode().equals(q.getQuestionType()));
         examPaper.setIsSubjective(hasSubjective ? 1 : 0);
 
-        int paperId = examPaperMapper.insertExamPaper(examPaper);
+        examPaperMapper.insertExamPaper(examPaper);
 
         // 新增试卷主包含的试题
         for (ExamPaperQuestion question : examPaper.getQuestions())
         {
-            question.setPaperId((long) paperId);
+            question.setPaperId(examPaper.getId());
             question.setCreateTime(DateUtils.getNowDate());
             question.setDelFlag("0");
             question.setCreateBy(SecurityUtils.getUsername());
         }
         examPaperQuestionMapper.batchInsertExamPaperQuestion(examPaper.getQuestions());
-        return paperId;
+        return Math.toIntExact(examPaper.getId());
     }
 
     /**
                                QuestionTypes.FILL_BLANK.getCode().equals(q.getQuestionType()));
         examPaper.setIsSubjective(hasSubjective ? 1 : 0);
 
-        int paperId = examPaperMapper.updateExamPaper(examPaper);
+        examPaperMapper.updateExamPaper(examPaper);
 
         // 更新试卷主包含的试题
         examPaperQuestionMapper.deleteExamPaperQuestionByPaperId(examPaper.getId());
         for (ExamPaperQuestion question : examPaper.getQuestions())
         {
-            question.setPaperId((long) paperId);
+            question.setPaperId(examPaper.getId());
             question.setCreateTime(DateUtils.getNowDate());
             question.setDelFlag("0");
             question.setCreateBy(SecurityUtils.getUsername());
         }
         examPaperQuestionMapper.batchInsertExamPaperQuestion(examPaper.getQuestions());
 
-        return paperId;
+        return Math.toIntExact(examPaper.getId());
     }
 
     /**