add admin head.

src/admin/problem/detail.vue

@@ -0,0 +1,7 @@
+<script setup lang="ts"></script>
+
+<template>
+  <div>problem detail</div>
+</template>
+
+<style scoped></style>

src/admin/problem/list.vue

@@ -0,0 +1,7 @@
+<script setup lang="ts"></script>
+
+<template>
+  <div>problem list</div>
+</template>
+
+<style scoped></style>