修改入口文件main.go，更新了用户处理器和考试服务的逻辑，同时修改了成绩服务的实现。请注意，config.yaml文件有未暂存的更改，需要先将其添加到暂存区才能提交。

internal/service/score_service.go

@@ -4,6 +4,7 @@ import (
 	"exam_registration/internal/dao"
 	"exam_registration/internal/model"
 	"errors"
+	"gorm.io/gorm"
 )
 
 type ScoreService struct{}
@@ -22,7 +23,7 @@ func (s *ScoreService) CreateScore(score *model.ExamScore) error {
 }
 
 func (s *ScoreService) BatchCreateScores(scores []model.ExamScore) error {
-	return dao.DB.Transaction(func(tx *dao.DB) error {
+	return dao.DB.Transaction(func(tx *gorm.DB) error {
 		for i := range scores {
 			scores[i].Pass = scores[i].Score >= 60