Zoom: remove user license (Pro/Business/Edu) via API

[LuD1161]

Goal: Free the Zoom paid license tied to the user.
Tasks:

• Research which Zoom action frees a seat (delete vs disassociate license).
• Identify Users API to update type or delete user.
• Input: email
• Steps: resolve user → downgrade/remove license or delete.
• Verify license pool count reflects change.
• Emit audit JSON (old/new type, action).

Acceptance:

• Dry-run available.
• Idempotent.

[LuD1161]

@AshhKetchup please update this one.