Retrieves the follower list of a TikTok account by handle or user_id — useful for seeing who follows a creator or getting subscriber data. Returns followers, an array of user objects each with nickname, unique_id, uid, follower_count, following_count, and avatar URLs; also returns total follower count. Paginate with min_time from the previous response. Uses the caller's OpenAny gateway credentials. Charges and authorization are determined by the gateway.