feature request add united domains api for dns challenge

Hello,

can you add the new united domain api for dns challenge?

Thanks

No files, tests, or explicit entry points are named. Start by locating the existing DNS provider integration files and where DNS providers are registered/loaded in this shell-based repo, then mirror one existing provider’s structure for a United Domains implementation. Check docs or provider lists to update any supported-dns-provider references. The issue is complete when United Domains appears in the supported provider guidance and can be invoked through the normal DNS challenge flow.

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