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/submission/detail.vue

@@ -12,7 +12,7 @@ import {
   submissionMemoryFormat,
   submissionResultTitle,
   submissionTimeFormat,
-  utoa,
+  compressToBase64,
 } from "utils/functions"
 import type { Submission } from "utils/types"
 import SubmissionResultTag from "shared/components/SubmissionResultTag.vue"
@@ -82,7 +82,7 @@ function copyToCat() {
     code: submission.value!.code,
     input: "",
   }
-  const base64 = utoa(JSON.stringify(data))
+  const base64 = compressToBase64(JSON.stringify(data))
   const url = `${import.meta.env.PUBLIC_CODE_URL}?share=${encodeURIComponent(base64)}`
   window.open(url, "_blank")
 }