Saves the camera's current position as a named preset. Move the camera to the desired position first.
The server finds a free numbered slot, waits for the camera and registers the confirmed token in Cloud;
the caller cannot choose the token. Names are trimmed and must contain 1–100 characters.

Returns the ACTIVE Cloud record with HTTP 200. If the camera creates the preset but Cloud registration fails,
an unregistered native preset remains on the camera. Refresh GET presets and register it before editing the
camera. Do not retry preset creation.

HTTP 202 means the result is unconfirmed. Do not retry after a 202, timeout or connection loss until
you refresh the relevant data and reconcile the camera state.