[Feature Request]: Accept the top-level domain name in the network dns setting

[1248289414]

🚀 Feature Summary

Accept the top-level domain name in the network dns setting.

📝 Detailed Description

Currently, when setting up dns for a network, ztnet only accepts subdomains,

ztnet/src/server/api/utils/ipUtils.ts

Lines 126 to 129 in 621c37a

	export function isValidDomain(domain: string): boolean {
	const domainRegex = /^(?!-)[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.[a-zA-Z]{2,}$/;
	return domainRegex.test(domain);
	}

but in zerotier.com, a top-level domain (e.g. .lan) is also a valid value.

And, it seems that Zerotier's DNS system only requires domain names to less than 128 characters in length?
https://github.com/zerotier/ZeroTierOne/blob/f176e2539e10e8c0f61eb1d2e1f0e690a267a646/include/ZeroTierOne.h#L976C1-L981C1

🎯 Use Case

Some DHCP/DNS servers support to use a custom top-level domains to get the client's address, such as dnsmasq in Openwrt uses the hostname + .lan to request the client's assigned address.

💡 Willing to Contribute

None