fix(ui): custom domain not being shown in the form

[ym]

fixes https://discord.com/channels/1270105230989594634/1443244273100263466/1443244273100263466

[Copilot]

Pull request overview

This PR fixes an issue where custom domain values were not being displayed in the network settings form. It also enhances backend domain handling to properly use DHCP-provided domain names in resolv.conf.

Key changes:

• Modified UI to detect, store, and display custom domain values when loading network settings
• Updated backend to pass DHCP lease domain information through to resolv.conf generation
• Fixed domain selection logic to treat "dhcp" as a configuration option rather than a literal domain name

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
ui/src/routes/devices.$id.settings.network.tsx	Adds logic to detect custom domains, store them in state, display them in the form input, and includes proper dependency tracking
pkg/nmlite/resolvconf.go	Adds domain field to resolv.conf template execution and adds debug logging for nameserver/search list configuration
pkg/nmlite/interface.go	Passes DHCP lease domain information to resolv.conf configuration
pkg/nmlite/hostname.go	Updates getDomain() to treat "dhcp" as a sentinel value rather than a literal domain name

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