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/problem/components/ProblemContent.vue

@@ -5,7 +5,7 @@ import { storeToRefs } from "pinia"
 import { useCodeStore } from "oj/store/code"
 import { useProblemStore } from "oj/store/problem"
 import { createTestSubmission } from "utils/judge"
-import type { Problem, ProblemFiltered, ProblemStatus } from "utils/types"
+import type { ProblemDetail, ProblemRow, ProblemStatus } from "utils/types"
 import Copy from "shared/components/Copy.vue"
 import { useDark } from "@vueuse/core"
 import { MdPreview } from "md-editor-v3"
@@ -13,7 +13,7 @@ import "md-editor-v3/lib/preview.css"
 import { getSimilarProblems } from "oj/api"
 import SQLDataTable from "./SQLDataTable.vue"
 
-type Sample = Problem["samples"][number] & {
+type Sample = ProblemDetail["samples"][number] & {
   id: number
   msg: string
   status: ProblemStatus
@@ -45,7 +45,7 @@ const sqlChangedTables = computed(() => {
 const router = useRouter()
 
 // 相似题目推荐
-const similarProblems = ref<ProblemFiltered[]>([])
+const similarProblems = ref<ProblemRow[]>([])
 const similarLoaded = ref(false)
 
 async function loadSimilarProblems() {
@@ -409,7 +409,7 @@ function type(status: ProblemStatus) {
                 {{ sp.title }}
               </n-button>
             </n-flex>
-            <!-- getSimilarProblems 已经过 filterResult，难度是中文，不是 Low/Mid/High -->
+            <!-- getSimilarProblems 已经过 toProblemRow，难度是中文，不是 Low/Mid/High -->
             <n-tag
               v-if="sp.difficulty"
               size="small"