Add account selection to About page so users can generate the group-join password for different QQ accounts. about.tsx: fetch quick-login list (QQManager.getQQQuickLoginListNew), track selectedUin with useState/useEffect, build account list (including current login as fallback), compute password per selected account (SHA512(hash + uin).substring(0,7)), and render a Select control and updated Snippet/Tooltip UI; also add a binding notice. README and translated docs: add note that the join key is only valid for the latest 100 versions and prompt users to update if it fails.