[FEATURE]:Support permanently deleting archived agents

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Feedback: Would like support for permanently deleting archived agents
Background
Currently, the multica agent CLI only provides two operations — archive and restore — with no ability to permanently delete or clear the archive list. Archived agents remain in the archive list and cannot be removed.

Request
Would like one of the following capabilities:

Permanent deletion: multica agent delete — completely removes an archived agent so it disappears from the archive list.
Clear the archive list: support batch-clearing of archived agents.
Current Impact
After creating test agents, even archiving them keeps them in the list forever, which hurts cleanliness and maintainability.

Expectation
Hope the Multica platform can provide the ability to permanently delete archived agents via the CLI or admin interface.