refactor(前端): shared / utils 不再 import oj 和 admin 下的任何东西

依赖方向原来是反的：顶栏、登录框、举手列表这些 shared 组件从 oj/ 里拿东西。
- 跨端的接口挪进 shared/api.ts（按 apps/web/CLAUDE.md 的分法）：学生端题目列表、
  出题人列表、这节课的题、待弹的成就
- 这节课的 store → shared/store/lesson.ts；头像 RankAvatar → shared/components
- 纯函数挪进 utils/：举手列表的错法归类 errorKind、它依赖的答案错误分类 wrongAnswer
  和 Python 报错翻译 pythonError、题目列表行的 toProblemRow
- 只有后台在用的出题人下拉 AuthorSelect 挪回 admin/components

纯搬家。首页、题目列表、题目页、排名、课堂看板、后台题目列表打开无报错，
顶栏题号框敲 1001 回车直达题目页。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/oj/problem/components/CompileErrorExplain.vue

@@ -10,7 +10,7 @@ import {
   showPunctuationMarks,
 } from "oj/problem/utils/errorMark"
 import { explainCCompileError } from "oj/problem/utils/cError"
-import { explainPythonCompileError } from "oj/problem/utils/pythonError"
+import { explainPythonCompileError } from "utils/pythonError"
 
 /**
  * 编译错误的中文说明卡片：Python 的语法错误走 pythonError.ts，C / C++ 的 gcc 报错走

apps/web/src/oj/problem/components/ContextBar.vue

@@ -4,7 +4,7 @@ import type { RouteLocationRaw } from "vue-router"
 import { getProblemSetDetail, getProblemSetProblems, joinProblemSet } from "oj/api"
 import { useContestStore } from "oj/store/contest"
 import { isFlowchartPass, useFlowchartStore } from "oj/store/flowchart"
-import { useLessonStore } from "oj/store/lesson"
+import { useLessonStore } from "shared/store/lesson"
 import { useProblemStore } from "oj/store/problem"
 import { useUserStore } from "shared/store/user"
 import { useBreakpoints } from "shared/composables/breakpoints"

apps/web/src/oj/problem/components/LessonNext.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { useThemeVars } from "naive-ui"
-import { useLessonStore } from "oj/store/lesson"
+import { useLessonStore } from "shared/store/lesson"
 
 /**
  * 通过之后告诉学生「这节课的下一题是哪道」。

apps/web/src/oj/problem/components/ProblemEditor.vue

@@ -18,7 +18,7 @@ import { useCollabHere, useTeacherCollab } from "../composables/teacherCollab"
 import { useProblemPageContext } from "../composables/problemPageContext"
 import CollabBar from "./CollabBar.vue"
 import { useFlowchartStore } from "oj/store/flowchart"
-import { useLessonStore } from "oj/store/lesson"
+import { useLessonStore } from "shared/store/lesson"
 
 const FlowchartEditor = defineAsyncComponent(
   () => import("shared/components/FlowchartEditor/index.vue"),

apps/web/src/oj/problem/components/SubmissionEffects.vue

@@ -5,7 +5,7 @@ import { getReaction } from "oj/api"
 import { useProblemStore } from "oj/store/problem"
 import { useSubmissionStore } from "oj/store/submission"
 import { useFireworks } from "oj/problem/composables/useFireworks"
-import { useLessonStore } from "oj/store/lesson"
+import { useLessonStore } from "shared/store/lesson"
 import { isFlowchartPass, useFlowchartStore } from "oj/store/flowchart"
 import { SubmissionStatus } from "utils/constants"
 import { useProblemPageContext } from "../composables/problemPageContext"

apps/web/src/oj/problem/components/SubmissionResult.vue

@@ -21,7 +21,7 @@ import WrongAnswerExplain from "./WrongAnswerExplain.vue"
 import LessonNext from "./LessonNext.vue"
 import ResultHeader from "./ResultHeader.vue"
 import SimilarProblems from "./SimilarProblems.vue"
-import { useLessonStore } from "oj/store/lesson"
+import { useLessonStore } from "shared/store/lesson"
 import { useProblemPageContext } from "../composables/problemPageContext"
 import Markdown from "shared/components/Markdown.vue"
 

apps/web/src/oj/problem/components/WrongAnswerExplain.vue

@@ -5,12 +5,7 @@ import { useThemeVars } from "naive-ui"
 import { useProblemStore } from "oj/store/problem"
 import { markdownToText } from "oj/problem/utils/plainText"
 import { JUDGE_STATUS, SubmissionStatus } from "utils/constants"
-import {
-  classifyDiff,
-  explainDiff,
-  firstDifferentLine,
-  type SampleCheck,
-} from "oj/problem/utils/wrongAnswer"
+import { classifyDiff, explainDiff, firstDifferentLine, type SampleCheck } from "utils/wrongAnswer"
 
 /**
  * 答案错误时的样例对比（数据见后端 judge/run.ts 的 checkSamples）。