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/rank/list.vue

@@ -24,7 +24,7 @@ import Pagination from "shared/components/Pagination.vue"
 import { ChartType, LONG_DURATION_OPTIONS } from "utils/constants"
 import { renderTableTitle } from "utils/renders"
 import Chart from "./components/Chart.vue"
-import Index from "./components/Index.vue"
+import RankMedal from "./components/RankMedal.vue"
 import { useUserStore } from "shared/store/user"
 import { Icon } from "@iconify/vue"
 import { MdPreview } from "md-editor-v3"
@@ -162,7 +162,7 @@ const columns: DataTableColumn<Rank>[] = [
     width: 100,
     align: "center",
     render: (_, index) =>
-      h(Index, { index, page: query.page, limit: query.limit }),
+      h(RankMedal, { index, page: query.page, limit: query.limit }),
   },
   {
     title: renderTableTitle(
@@ -287,8 +287,8 @@ const weeklyColumns: DataTableColumn<WeeklyRankItem>[] = [
     key: "rank",
     width: 100,
     align: "center",
-    // rank 是服务端给的周榜名次，不是行号 —— 换算回 Index 要的 0 基下标
-    render: (row) => h(Index, { index: row.rank - 1, page: 1, limit: 10 }),
+    // rank 是服务端给的周榜名次，不是行号 —— 换算回 RankMedal 要的 0 基下标
+    render: (row) => h(RankMedal, { index: row.rank - 1, page: 1, limit: 10 }),
   },
   {
     title: renderTableTitle(