feat(player): theme-2 登录/注册/找回密码使用 zt2.webp 背景

替换 h5bg.webp，仅 theme-2 玩家端认证页

apps/player/src/views/RegisterView.vue

@@ -9,7 +9,7 @@ import { useSmsCode } from '../composables/useSmsCode';
 import LocaleSwitcher from '../components/LocaleSwitcher.vue';
 import PhoneCountrySelect from '../components/PhoneCountrySelect.vue';
 import GoldSpinner from '../components/GoldSpinner.vue';
-import loginBg from '../assets/images/h5bg.webp';
+import loginBg from '../assets/images/zt2.webp';
 
 const { t, locale } = useI18n();
 const { initFromUser } = useAppLocale();