feat: 完善接口19-顶部通知铃铛与站内通知中心

src/components/core/layouts/art-header-bar/index.vue

@@ -238,9 +238,7 @@
   const { width } = useWindowSize()
 
   const unreadCount = computed(() => notificationStore.unreadCount)
-  const formattedUnreadCount = computed(() =>
-    unreadCount.value > 99 ? '99+' : String(unreadCount.value)
-  )
+  const formattedUnreadCount = computed(() => notificationStore.displayCount)
 
   const menuTopWidth = computed(() => {
     return width.value * 0.5