feat: 产品/客户/订单批量删除；接入 GeoLite2 城市库（地理分布/激活记录/审计日志显示归属地）；仪表盘趋势图美化

backend/internal/service/license/license_service.go

@@ -454,6 +454,7 @@ func toActivationResponse(a model.Activation) dto.ActivationResponse {
 		DeviceName:  a.DeviceName,
 		DeviceInfo:  a.DeviceInfo,
 		IP:          a.IP,
+		Location:    utils.LookupIPLocation(a.IP),
 		Status:      a.Status,
 		IsOnline:    a.IsOnline,
 		ActivatedAt: a.ActivatedAt.Format("2006-01-02 15:04:05"),