refactor: 修复DRY分页 + LoD违规(RefreshToken业务逻辑下沉)

- audit_service.List()使用common.Pagination替代手动分页计算
- RefreshToken封禁状态检查从控制器移至TokenService.RefreshAccessToken
- 消除控制器层业务逻辑，符合瘦控制器铁律

internal/service/audit_service.go

@@ -225,20 +225,15 @@ func (s *AuditService) applyApproval(submission *model.AuditSubmission) error {
 
 // List 分页查询审核列表
 func (s *AuditService) List(auditType, status string, page, pageSize int) (*AuditListResult, error) {
-	if page < 1 {
-		page = 1
-	}
-	if pageSize < 1 || pageSize > 100 {
-		pageSize = 20
-	}
-	offset := (page - 1) * pageSize
+	p := common.Pagination{Page: page, PageSize: pageSize}
+	p.DefaultPagination()
 
 	total, err := s.auditRepo.CountAudits(auditType, status)
 	if err != nil {
 		return nil, err
 	}
 
-	items, err := s.auditRepo.ListAudits(auditType, status, offset, pageSize)
+	items, err := s.auditRepo.ListAudits(auditType, status, p.Offset(), p.PageSize)
 	if err != nil {
 		return nil, err
 	}
@@ -249,7 +244,7 @@ func (s *AuditService) List(auditType, status string, page, pageSize int) (*Audi
 	return &AuditListResult{
 		Items: items,
 		Total: total,
-		Page:  page,
+		Page:  p.Page,
 	}, nil
 }