add announcement.

src/shared/components/Header.vue

@@ -51,6 +51,10 @@ const menus = computed<MenuOption[]>(() => [
     label: () => h(RouterLink, { to: "/rank" }, { default: () => "排名" }),
     key: "rank",
   },
+  {
+    label: () => h(RouterLink, { to: "/announcement" }, { default: () => "公告" }),
+    key: "announcement",
+  },
   {
     label: () => h(RouterLink, { to: "/admin" }, { default: () => "后台" }),
     show: userStore.isAdminRole,