refactor: 一批名不副实的命名改掉（只动一端，不碰契约）

后端：
- getUserByToken → authenticateToken：它会删会话、续 TTL、记在线，不是纯读
- todayStart → dayStart(instant)：本来就接受任意时刻，不只是「今天」
- objectValue → asRecord，删掉 4 份一模一样的私有拷贝和 `as toObject` 别名
- 报错文案 "does not exists" / "Already be a public problem" 改通顺

前端：
- utils/types 里 Contest / User / Problem 三个别名删掉：Contest 原来指后台
  比赛、契约里同名的却是学生侧。现在 Contest = 学生侧、AdminContest = 后台，
  后台用户表单叫 AdminUserForm，题目详情直接用 ProblemDetail
- SubmissionInfo → ContestSubmissionInfo，免得和 submission.info 撞名
- utoa / atou → compressToBase64 / decompressFromBase64（实际是 zlib + base64），
  encode / decode → base64EncodeUtf8 / base64DecodeUtf8
- filterResult → toProblemRow、toProblemListItem → toAdminProblemRow，
  行字段 submission / rate → submissionCount / acRate
- 组件：Modal → AddFromLibraryModal、Form → EditorToolbar、
  ContestEditor → BasicEditor（题单也在用它）、rank 的 Index → RankMedal、
  Name → UserNameCell、Password → PasswordCell、ContestType → ContestAccessTag

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

apps/web/src/admin/user/components/UserNameCell.vue

@@ -0,0 +1,42 @@
+<script setup lang="ts">
+import { PROBLEM_PERMISSION, USER_TYPE } from "utils/constants"
+import { getUserRole } from "utils/functions"
+import type { AdminUserForm } from "utils/types"
+import TextCopy from "shared/components/TextCopy.vue"
+
+interface Props {
+  user: AdminUserForm
+}
+const props = defineProps<Props>()
+const hasRoleTag = computed(
+  () => props.user.adminType !== USER_TYPE.REGULAR_USER,
+)
+</script>
+<template>
+  <n-flex align="center">
+    <n-tag v-if="props.user.isDisabled" type="error" size="small">
+      封号中
+    </n-tag>
+    <n-tag
+      v-if="hasRoleTag"
+      :type="getUserRole(props.user.adminType).type"
+      size="small"
+    >
+      {{ getUserRole(props.user.adminType).label }}
+    </n-tag>
+    <n-tag
+      size="small"
+      v-if="
+        props.user.adminType === USER_TYPE.STUDENT_ADMIN ||
+        props.user.adminType === USER_TYPE.TEACHER_ADMIN
+      "
+    >
+      {{
+        props.user.problemPermission === PROBLEM_PERMISSION.ALL
+          ? "全部"
+          : "仅自己"
+      }}
+    </n-tag>
+    <TextCopy>{{ props.user.username }}</TextCopy>
+  </n-flex>
+</template>