refactor: 统一状态名称映射为公共函数，清理废弃换卡/商户类型常量和模型

internal/service/enterprise/service.go

@@ -131,7 +131,7 @@ func (s *Service) Create(ctx context.Context, req *dto.CreateEnterpriseReq) (*dt
 			District:        enterprise.District,
 			Address:         enterprise.Address,
 			Status:          enterprise.Status,
-			StatusName:      getStatusName(enterprise.Status),
+			StatusName:      constants.GetStatusName(enterprise.Status),
 			CreatedAt:       enterprise.CreatedAt.Format("2006-01-02 15:04:05"),
 		},
 		AccountID: account.ID,
@@ -345,7 +345,7 @@ func (s *Service) List(ctx context.Context, req *dto.EnterpriseListReq) (*dto.En
 			District:        e.District,
 			Address:         e.Address,
 			Status:          e.Status,
-			StatusName:      getStatusName(e.Status),
+			StatusName:      constants.GetStatusName(e.Status),
 			CreatedAt:       e.CreatedAt.Format("2006-01-02 15:04:05"),
 		})
 	}
@@ -357,10 +357,3 @@ func (s *Service) List(ctx context.Context, req *dto.EnterpriseListReq) (*dto.En
 		Size:  opts.PageSize,
 	}, nil
 }
-
-func getStatusName(status int) string {
-	if status == constants.StatusEnabled {
-		return "启用"
-	}
-	return "禁用"
-}