feat(rewards): add toast and captcha flow

inc/modules/captcha.php

@@ -374,6 +374,7 @@ function aksrt_captcha_scenes(): array {
 		'download'         => __('资源下载', 'aksrt'),
 		'signin'           => __('每日签到', 'aksrt'),
 		'front_submit'     => __('前台投稿', 'aksrt'),
+		'tip_user'         => __('打赏用户', 'aksrt'),
 	];
 }