chore: 将前端移动到 client/ 目录，准备合并为单仓库

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/submissions/TaskTitle.vue

@@ -0,0 +1,37 @@
+<template>
+  <n-flex>
+    <n-tag
+      size="small"
+      :bordered="false"
+      type="primary"
+      v-if="props.submission.task_type === 'tutorial'"
+    >
+      教程
+    </n-tag>
+    <n-tag
+      :bordered="false"
+      size="small"
+      type="error"
+      v-if="props.submission.task_type === 'challenge'"
+    >
+      挑战
+    </n-tag>
+    <n-button text @click="open">{{ props.submission.task_title }}</n-button>
+  </n-flex>
+</template>
+<script setup lang="ts">
+import { useRouter } from "vue-router"
+import type { SubmissionOut } from "../../utils/type"
+import { goHome } from "../../utils/helper"
+
+interface Props {
+  submission: SubmissionOut
+}
+
+const props = defineProps<Props>()
+
+const router = useRouter()
+function open() {
+  goHome(router, props.submission.task_type, props.submission.task_display)
+}
+</script>