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/api/src/db/schema.ts

@@ -1195,7 +1195,7 @@ export const problemsetBadge = pgTable(
  * 冲突目标就是 (user_id, tutorial_id)，再挂个 id 序列没有任何用处。
  *
  * **只记「读到哪一课 + 停留多久」。** 练一练的作答另有一张表（下面的 `exerciseAttempt`），
- * 一个学生一道练习一行；「学完」由两张表合起来判（契约的 `isLessonDone`）。
+ * 一个学生一道练习一行；「学完」由两张表合起来判（契约的 `isTutorialDone`）。
  *
  * 外键这里**用了库级 CASCADE**，和 Django 建的那些 NO ACTION 外键不同：删教程、删用户
  * 都不必再记得回来手工清一遍子表（后台删教程的事务里就没清它，靠的就是这里）。

apps/api/src/routes/admin/learn.ts

@@ -1,7 +1,7 @@
 import {
   FLOWCHART_PASS_GRADES,
   STUDENT_ROLES,
-  isLessonDone,
+  isTutorialDone,
   type LearnBoard,
   type LearnBoardStudent,
   type LearnExerciseAttemptList,
@@ -198,7 +198,7 @@ adminLearnRoutes.get('/learn-analytics/board', requireTeacher, async (c) => {
     students: students.map((student) => {
       const opened: number[] = []
       const done: number[] = []
-      const lessons: LearnBoardStudent['lessons'] = []
+      const attempts: LearnBoardStudent['tutorials'] = []
       let exerciseSolved = 0
       let totalSeconds = 0
       let lastViewedAt: string | null = null
@@ -210,26 +210,26 @@ adminLearnRoutes.get('/learn-analytics/board', requireTeacher, async (c) => {
         exerciseSolved += solvedHere
         if (exercises) {
           const { tried, solved, wrongAttempts } = exercises
-          lessons.push({ tutorialId: tutorial.id, tried, solved, wrongAttempts })
+          attempts.push({ tutorialId: tutorial.id, tried, solved, wrongAttempts })
         }
         if (row) {
           opened.push(tutorial.id)
           totalSeconds += row.totalSeconds
           if (!lastViewedAt || row.lastViewedAt > lastViewedAt) lastViewedAt = row.lastViewedAt
         }
-        const lesson = {
+        const here = {
           viewCount: row?.viewCount ?? 0,
           exerciseTotal: tutorial.exerciseTotal,
           exerciseSolved: solvedHere,
         }
-        if (isLessonDone(lesson)) done.push(tutorial.id)
+        if (isTutorialDone(here)) done.push(tutorial.id)
       }
       return {
         ...student,
         opened,
         done,
         exerciseSolved,
-        lessons,
+        tutorials: attempts,
         problems: problemsOf.get(student.userId) ?? [],
         totalSeconds,
         lastViewedAt,
@@ -394,27 +394,27 @@ adminLearnRoutes.get('/learn-analytics/students/:id', requireTeacher, async (c)
     ).map((row) => [row.problemId, row]),
   )
 
-  const byLesson = new Map<number, LearnStudentDetail['lessons'][number]['exercises']>()
+  const byTutorial = new Map<number, LearnStudentDetail['tutorials'][number]['exercises']>()
   for (const { tutorialId, ...row } of exercises) {
-    const list = byLesson.get(tutorialId) ?? []
+    const list = byTutorial.get(tutorialId) ?? []
     list.push({
       ...row,
       attempts: row.attempts ?? 0,
       solved: row.solved ?? false,
     })
-    byLesson.set(tutorialId, list)
+    byTutorial.set(tutorialId, list)
   }
 
   return success(c, {
     ...student,
-    lessons: tutorials
+    tutorials: tutorials
       .map((row) => ({
         tutorialId: row.tutorialId,
         title: row.title,
         viewCount: row.viewCount ?? 0,
         totalSeconds: row.totalSeconds ?? 0,
         lastViewedAt: row.lastViewedAt,
-        exercises: byLesson.get(row.tutorialId) ?? [],
+        exercises: byTutorial.get(row.tutorialId) ?? [],
         problems: related
           .filter((problem) => problem.tutorialId === row.tutorialId)
           .map(({ id: problemId, displayId, title }) => {