Simplify domain change in Hossted CLI

[Alina990612]

Description:

Currently, changing the domain in Hossted CLI using the command:

hossted set domain <domain>

requires the user to log in and add a virtual machine to the dashboard before the domain is actually updated.

Acceptance criteria:

• After running hossted set domain <domain> with all necessary conditions met, the domain should change immediately without requiring login or VM registration.
• The CLI flow should be simplified so that no additional steps are needed.

Additional notes:

• Ensure that all validations and safety checks remain intact.
• This change should streamline the user experience when updating domains.

[linear]

HOS-55