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/app/(dashboard)/settings/page.tsx

@@ -5,11 +5,14 @@ import { AdminSettingsView } from "@/modules/settings/components/admin-settings-
 import { StudentSettingsView } from "@/modules/settings/components/student-settings-view"
 import { TeacherSettingsView } from "@/modules/settings/components/teacher-settings-view"
 import { getUserProfile } from "@/modules/users/data-access"
-import { getNotificationPreferences } from "@/modules/messaging/notification-preferences"
-import { Permissions } from "@/shared/types/permissions"
+import { getNotificationPreferences } from "@/modules/notifications/preferences"
 
 export const dynamic = "force-dynamic"
 
+export const metadata = {
+  title: "Settings",
+}
+
 export default async function SettingsPage() {
   const ctx = await requireAuth()
 
@@ -18,13 +21,13 @@ export default async function SettingsPage() {
 
   if (!userProfile) redirect("/login")
 
-  const permissions = ctx.permissions
+  const roles = ctx.roles
   const notificationPrefs = await getNotificationPreferences(userId)
 
-  if (permissions.includes(Permissions.SETTINGS_ADMIN)) {
+  if (roles.includes("admin")) {
     return <AdminSettingsView user={userProfile} notificationPreferences={notificationPrefs} />
   }
-  if (permissions.includes(Permissions.HOMEWORK_SUBMIT) && !permissions.includes(Permissions.EXAM_CREATE)) {
+  if (roles.includes("student")) {
     return <StudentSettingsView user={userProfile} notificationPreferences={notificationPrefs} />
   }
   return <TeacherSettingsView user={userProfile} notificationPreferences={notificationPrefs} />