feat: 新增备课模块并修复全模块 P0/P1/P2 缺陷

主要变更:

- 新增 lesson-preparation 模块: 备课编辑器、节点编辑、AI 建议、知识点选择、版本历史、作业发布

- 新增 shared 通用组件: charts/question-bank-filters/schedule-list/ui (chip-nav/filter-bar/page-header/stat-card/stat-item)

- 新增 student/admin 端 loading.tsx 与 error.tsx, 优化加载与错误态体验

- 新增 teacher/lesson-plans 页面 (列表/新建/编辑)

- 新增 drizzle 迁移 0002_tiny_lionheart 及 snapshot

- 新增 textbooks/schema.ts 与 exams/utils/normalize-structure.ts

- 修复 Tiptap v3 SSR hydration 崩溃 (rich-text-block immediatelyRender: false)

- 重构多模块 data-access/actions/组件, 修复权限校验与类型规范

- 同步架构文档 004/005 反映新增模块、导出、依赖关系

- 归档 bugs/* 测试报告与 e2e 测试脚本 (admin/parent/student/teacher web_test)

src/modules/diagnostic/data-access.ts

@@ -116,52 +116,62 @@ export async function updateMasteryFromSubmission(submissionId: string): Promise
   }
 
   const now = new Date()
-  for (const [kpId, stat] of kpStats.entries()) {
-    const masteryLevel = stat.total > 0 ? round2((stat.correct / stat.total) * 100) : 0
-    await db
-      .insert(knowledgePointMastery)
-      .values({
-        studentId: submission.studentId,
-        knowledgePointId: kpId,
-        masteryLevel: String(masteryLevel),
-        totalQuestions: stat.total,
-        correctQuestions: stat.correct,
-        lastAssessedAt: now,
-      })
-      .onDuplicateKeyUpdate({
-        set: {
+  await Promise.all(
+    Array.from(kpStats.entries()).map(async ([kpId, stat]) => {
+      const masteryLevel = stat.total > 0 ? round2((stat.correct / stat.total) * 100) : 0
+      await db
+        .insert(knowledgePointMastery)
+        .values({
+          studentId: submission.studentId,
+          knowledgePointId: kpId,
           masteryLevel: String(masteryLevel),
           totalQuestions: stat.total,
           correctQuestions: stat.correct,
           lastAssessedAt: now,
-          updatedAt: now,
-        },
-      })
-  }
+        })
+        .onDuplicateKeyUpdate({
+          set: {
+            masteryLevel: String(masteryLevel),
+            totalQuestions: stat.total,
+            correctQuestions: stat.correct,
+            lastAssessedAt: now,
+            updatedAt: now,
+          },
+        })
+    }),
+  )
 }
 
 /** 获取班级掌握度摘要 */
 export const getClassMasterySummary = cache(async (classId: string): Promise<ClassMasterySummary | null> => {
   const classExists = await getClassExists(classId)
   if (!classExists) return null
-  const className = (await getClassNameById(classId)) ?? "Unknown"
 
-  const studentIds = await getActiveStudentIdsByClassId(classId)
+  // 班级名称 与 学生列表 相互独立，并行拉取
+  const [classNameResult, studentIds] = await Promise.all([
+    getClassNameById(classId),
+    getActiveStudentIdsByClassId(classId),
+  ])
+  const className = classNameResult ?? "Unknown"
+
   if (studentIds.length === 0) {
     return { classId, className, studentCount: 0, averageMastery: 0, knowledgePointStats: [], studentsNeedingAttention: [] }
   }
 
-  const userMap = await getUserNamesByIds(studentIds)
+  // 学生姓名 与 掌握度记录 相互独立，并行拉取
+  const [userMap, masteryRows] = await Promise.all([
+    getUserNamesByIds(studentIds),
+    db
+      .select({ mastery: knowledgePointMastery, kpName: knowledgePoints.name })
+      .from(knowledgePointMastery)
+      .leftJoin(knowledgePoints, eq(knowledgePoints.id, knowledgePointMastery.knowledgePointId))
+      .where(inArray(knowledgePointMastery.studentId, studentIds)),
+  ])
+
   const students = studentIds
     .map((id) => ({ id, name: userMap.get(id)?.name ?? null }))
     .sort((a, b) => (a.name ?? "").localeCompare(b.name ?? ""))
 
-  const masteryRows = await db
-    .select({ mastery: knowledgePointMastery, kpName: knowledgePoints.name })
-    .from(knowledgePointMastery)
-    .leftJoin(knowledgePoints, eq(knowledgePoints.id, knowledgePointMastery.knowledgePointId))
-    .where(inArray(knowledgePointMastery.studentId, studentIds))
-
   const byKp = new Map<string, { name: string; levels: number[]; mastered: number; notMastered: number }>()
   const byStudent = new Map<string, { levels: number[]; weakCount: number }>()
   for (const s of students) byStudent.set(s.id, { levels: [], weakCount: 0 })