Behavior: Loads the specified content record and creates a duplicate copy with a new ID, new MasterId, fresh timestamps, and cleared modification user fields. The duplicate is returned but not yet persisted; the client must submit it via a create/save endpoint to persist the copy.

Authorization: Requires authentication and the user must have write or higher permission to the content definition. Read-only and Guest permissions are insufficient.

Side Effects: None. The duplicated content is not persisted until a subsequent save call.

Error Scenarios: Returns 400 Bad Request if the content definition ID refers to asset metadata or assets, if the original content record does not exist, if the content definition is invalid, or if the user lacks sufficient write permissions.