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)/admin/course-plans/[id]/edit/page.tsx

@@ -1,18 +1,24 @@
 import { notFound } from "next/navigation"
+import type { Metadata } from "next"
+import type { JSX } from "react"
 
-import { getCoursePlanById } from "@/modules/course-plans/data-access"
-import { getSubjectOptions } from "@/modules/course-plans/data-access"
+import { getCoursePlanById, getSubjectOptions } from "@/modules/course-plans/data-access"
 import { getAdminClasses } from "@/modules/classes/data-access"
 import { getAcademicYears, getStaffOptions } from "@/modules/school/data-access"
 import { CoursePlanForm } from "@/modules/course-plans/components/course-plan-form"
 
+export const metadata: Metadata = {
+  title: "编辑课程计划 - Next_Edu",
+  description: "更新课程计划详情",
+}
+
 export const dynamic = "force-dynamic"
 
 export default async function EditCoursePlanPage({
   params,
 }: {
   params: Promise<{ id: string }>
-}) {
+}): Promise<JSX.Element> {
   const { id } = await params
 
   const [plan, classes, subjects, teachers, academicYears] = await Promise.all([
@@ -28,8 +34,8 @@ export default async function EditCoursePlanPage({
   return (
     <div className="flex h-full flex-col space-y-8 p-8">
       <div>
-        <h2 className="text-2xl font-bold tracking-tight">Edit Course Plan</h2>
-        <p className="text-muted-foreground">Update the course plan details below.</p>
+        <h2 className="text-2xl font-bold tracking-tight">编辑课程计划</h2>
+        <p className="text-muted-foreground">更新课程计划详情。</p>
       </div>
       <CoursePlanForm
         mode="edit"

src/app/(dashboard)/admin/course-plans/[id]/page.tsx

@@ -1,15 +1,22 @@
 import { notFound } from "next/navigation"
+import type { Metadata } from "next"
+import type { JSX } from "react"
 
 import { getCoursePlanById } from "@/modules/course-plans/data-access"
 import { CoursePlanDetail } from "@/modules/course-plans/components/course-plan-detail"
 
+export const metadata: Metadata = {
+  title: "课程计划详情 - Next_Edu",
+  description: "查看课程计划详情",
+}
+
 export const dynamic = "force-dynamic"
 
 export default async function CoursePlanDetailPage({
   params,
 }: {
   params: Promise<{ id: string }>
-}) {
+}): Promise<JSX.Element> {
   const { id } = await params
   const plan = await getCoursePlanById(id)