refactor(目录): 目录名对上界面上的名字，自学的「一课」不再也叫 lesson

- 后台课堂任务 admin/lesson → admin/task（/admin/task），和前台 oj/task 对上
- 后台首页 admin/setting/home.vue → admin/home/，设置 → admin/config/
- 卡点分析、年度趋势从 admin/problem 搬到 admin/analytics（/admin/analytics/stuck|trend），和菜单的「学情分析」、后端 analytics.ts 对上
- 首页 dashboard.vue / TeacherHome.vue → student.vue / teacher.vue；自学首页 home.vue → index.vue，看一课 index.vue → tutorial.vue
- lesson 只表示课堂上的一节：自学那边改叫 tutorial（oj/learn/lesson.ts → utils.ts、isLessonDone → isTutorialDone、Lesson*.vue → Tutorial*.vue、自学情况的 lessons 字段 → tutorials）
- 旧地址不留跳转

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

apps/web/src/admin/tutorial/list.vue

@@ -2,7 +2,7 @@
 import { Icon } from '@iconify/vue'
 import { errorMessage } from 'utils/api'
 import type { TutorialListItem } from 'utils/types'
-import { groupByProject, splitTitle, type TutorialType } from 'oj/learn/lesson'
+import { groupByProject, splitTitle, type TutorialType } from 'oj/learn/utils'
 import ProjectTile from 'oj/learn/components/ProjectTile.vue'
 import 'oj/learn/learn.css'
 import { getTutorialList, renameTutorialProject, reorderTutorials, setTutorialVisibility } from '../api'
@@ -28,11 +28,11 @@ const list = computed(() => all.value[type.value] ?? [])
 const groups = computed(() =>
   groupByProject(list.value)
     .map((group) => {
-      const items = group.lessons.map((lesson) => list.value.find((item) => item.id === lesson.id)!)
+      const items = group.tutorials.map((entry) => list.value.find((item) => item.id === entry.id)!)
       return {
         ...group,
         items,
-        key: `${group.project}:${group.lessons[0]!.id}`,
+        key: `${group.project}:${group.tutorials[0]!.id}`,
         hidden: items.every((item) => !item.isPublic),
       }
     })
@@ -189,7 +189,7 @@ onMounted(load)
           <div
             v-for="item in group.items"
             :key="item.id"
-            class="row lesson"
+            class="row tutorial"
             :class="{ off: !item.isPublic, dragging: dragId === item.id }"
             draggable="true"
             @dragstart="dragId = item.id"
@@ -330,10 +330,10 @@ onMounted(load)
 .group-name {
   font-weight: 700;
 }
-.lesson.off {
+.tutorial.off {
   opacity: 0.6;
 }
-.lesson.dragging {
+.tutorial.dragging {
   opacity: 0.35;
 }
 .handle {