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/oj/contest/components/ContestInfo.vue

@@ -2,7 +2,7 @@
 import { Icon } from "@iconify/vue"
 import { useContestStore } from "oj/store/contest"
 import { parseTime } from "utils/functions"
-import ContestType from "shared/components/ContestType.vue"
+import ContestAccessTag from "shared/components/ContestAccessTag.vue"
 
 const contestStore = useContestStore()
 </script>
@@ -30,7 +30,7 @@ const contestStore = useContestStore()
         {{ parseTime(contestStore.contest.endTime, "YYYY年M月D日 HH:mm:ss") }}
       </n-descriptions-item>
       <n-descriptions-item label="比赛类型">
-        <ContestType :contest="contestStore.contest" />
+        <ContestAccessTag :contest="contestStore.contest" />
       </n-descriptions-item>
       <n-descriptions-item label="发起人">
         {{ contestStore.contest.createdBy.username }}