add acm helper.

src/oj/contest/pages/helper.vue

@@ -0,0 +1,13 @@
+<script lang="ts" setup>
+const columns: DataTableColumn[] = [
+  { title: "AC 时间", key: "ac_time" },
+  { title: "问题 ID", key: "problem_display_id" },
+  { title: "一血", key: "is_first_ac" },
+  { title: "用户名", key: "username" },
+  { title: "状态", key: "status" },
+  { title: "选项", key: "actions" },
+]
+</script>
+<template>
+  <n-data-table :columns="columns"></n-data-table>
+</template>