fix testcat button.

src/oj/problem/components/TestCat2.vue

@@ -0,0 +1,29 @@
+<script lang="ts" setup>
+import { LANGUAGE } from "~/utils/types"
+
+interface Props {
+  lang: LANGUAGE
+  input: string
+}
+const props = withDefaults(defineProps<Props>(), {
+  lang: "C",
+  input: "",
+})
+function gotoTestCat() {
+  const url = "https://code.hyyz.izhai.net/"
+  let id = 50
+  const lang = props.lang
+  if (lang === "Python3") id = 71
+  if (lang === "Java") id = 62
+  const payload = { input: props.input || "", id }
+  try {
+    const encoded = window.btoa(encodeURIComponent(JSON.stringify(payload)))
+    window.open(`${url}?stdin=${encoded}`, "_blank")
+  } catch (e) {
+    window.open(url, "_blank")
+  }
+}
+</script>
+<template>
+  <n-button @click="gotoTestCat">自测猫</n-button>
+</template>