feat: add admin gradebook page

src/pages/Dashboard.vue

@@ -48,6 +48,11 @@ const menu = computed(() =>
       route: { name: "showcase-manage" },
       show: roleSuper.value,
     },
+    {
+      label: "平时成绩",
+      route: { name: "gradebook" },
+      show: roleAdmin.value || roleSuper.value,
+    },
     {
       label: "提交",
       route: { name: "submissions", params: { page: 1 } },