fix(活动页): 修复可能会在周一00：00：00不刷新的问题

src/views/TopList/TopList.vue

@@ -816,15 +816,17 @@ const formatTime = (value) => {
   return value < 10 ? `0${value}` : value
 }
 
+const targetTime = ref(getNextMonday()) // 闭包保存目标时间 (核心修正)
+
 // 更新倒计时
 const getCountdown = () => {
   const now = Date.now()
-  const targetTime = getNextMonday()
-  let diff = targetTime - now
+  let diff = targetTime.value - now
 
   if (diff <= 0) {
-    diff = getNextMonday() - now
     updatePageData() // 刷新页面数据
+    targetTime.value += 7 * 86400000 // +7天 (更新闭包变量)
+    diff = targetTime.value - now
   }
 
   // 计算时间单位