移除游戏页面的图片刷新逻辑，简化组件代码结构

src/components/play/GamePage.vue

@@ -113,16 +113,6 @@ export default {
       const diff = total - completed
       return diff > 0 ? diff : 0
     }
-  },
-  mounted() {
-    this.setupImageRefresh()
-  },
-  methods: {
-    setupImageRefresh() {
-      setInterval(() => {
-        this.timestamp = Date.now()
-      }, 5000)
-    }
   }
 }
 </script>