Delete Staff User

Delete a staff user. Requires admin authentication. Non-developer admins cannot delete developer users, and no one can delete their own account.

Deletes the user and cascades to:

• Calendar records (calendars, google_calendars, calendar_events)
• User availability records (user_day_availability)
• Staff group memberships (staff_group_member)

Sets to NULL:

• Staff group created_by/updated_by references
• Customer google_workspace_admin_user_id reference