* 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
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Co-authored-by: naiba <hi@nai.ba>