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/list.vue

@@ -3,7 +3,7 @@ import { useRouteQuery } from "@vueuse/router"
 import { NTag } from "naive-ui"
 import { getContestList } from "oj/api"
 import { duration, parseTime } from "utils/functions"
-import type { OjContest } from "utils/types"
+import type { Contest } from "utils/types"
 import ContestTitle from "shared/components/ContestTitle.vue"
 import Pagination from "shared/components/Pagination.vue"
 import { useAuthModalStore } from "shared/store/authModal"
@@ -29,7 +29,7 @@ const { query, clearQuery } = usePagination<ContestQuery>({
   tag: useRouteQuery("tag", "").value,
 })
 
-const data = ref<OjContest[]>([])
+const data = ref<Contest[]>([])
 const total = ref(0)
 
 const options: SelectOption[] = [
@@ -46,7 +46,7 @@ const tags: SelectOption[] = [
   { label: "期末", value: "期末" },
 ]
 
-const columns: DataTableColumn<OjContest>[] = [
+const columns: DataTableColumn<Contest>[] = [
   {
     title: renderTableTitle("状态", "streamline-emojis:collision"),
     key: "status",
@@ -116,7 +116,7 @@ watchDebounced(() => query.keyword, listContests, {
 // 监听其他查询条件变化
 watch(() => [query.page, query.limit, query.status, query.tag], listContests)
 
-function rowProps(row: OjContest) {
+function rowProps(row: Contest) {
   return {
     style: "cursor: pointer",
     onClick() {