* Update main.go Add --ipv6-countrycode runtime parameter to set the region flag using IPv6 by default. * Update service.go Add --ipv6-countrycode runtime parameter to set the region flag using IPv6 by default. * Update myip.go Add --ipv6-countrycode runtime parameter to set the region flag using IPv6 by default. * chore: rename --------- Co-authored-by: naiba <hi@nai.ba>