fix: 修复翻牌音效播放失败问题

移除 AudioController 依赖，直接使用 Audio 对象播放新增的 checkout.mp3 音频文件，避免因 AudioController 实例化或配置问题导致的音效播放失败。

apps/admin/src/views/user/cover/index.vue

@@ -1,20 +1,19 @@
 <script setup lang="ts">
 import { computed, onMounted, ref, watch } from 'vue'
 import { useRoute } from 'vue-router'
+import checkoutAudio from '@/assets/audio/checkout.mp3'
 import CompetitionLayout from '@/components/custom/user/CompetitionLayout.vue'
 import { PublishStatus } from '@/enum/business'
 import { useRouterPush } from '@/hooks/common/router'
 import { fetchUpdatePublishStatus } from '@/service/api/competition'
 import { fetchGetQuestionTableByActivityID } from '@/service/api/game'
 import { useActivityInfoStore } from '@/store/modules/activityinfo'
-import { AudioController } from '@/utils/audio'
 import { filterRepeat } from '@/utils/data'
 
 const activityInfoStore = useActivityInfoStore()
 const activityInfo = computed(() => activityInfoStore.activityInfo)
 
 const { routerPushByKey, routerBack } = useRouterPush()
-const audioController = new AudioController()
 
 interface QuestionItem {
   id: number
@@ -128,7 +127,8 @@ function toggleFlip(index: number) {
   }
   else {
     flippedCards.value.add(index)
-    audioController.play('flip') // 翻牌动效
+    const audio = new Audio(checkoutAudio)
+    audio.play().catch(e => console.error('Play audio failed', e))
   }
   // 每次点击都播放翻牌音效（无论翻开还是翻回去）
   // audioController.play('flip')