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/lesson-preparation/schema.ts

@@ -0,0 +1,34 @@
+import { z } from "zod";
+
+export const createLessonPlanSchema = z.object({
+  title: z.string().min(1, "请输入课案标题").max(255),
+  textbookId: z.string().optional(),
+  chapterId: z.string().optional(),
+  subjectId: z.string().optional(),
+  gradeId: z.string().optional(),
+  templateId: z.string().min(1, "请选择模板"),
+});
+
+export const updateLessonPlanContentSchema = z.object({
+  planId: z.string().min(1),
+  title: z.string().min(1).max(255).optional(),
+  content: z.unknown(), // Block 文档结构由 types 守卫，运行时只校验存在
+});
+
+export const saveVersionSchema = z.object({
+  planId: z.string().min(1),
+  label: z.string().max(100).optional(),
+});
+
+export const revertVersionSchema = z.object({
+  planId: z.string().min(1),
+  versionNo: z.number().int().positive(),
+});
+
+export const saveAsTemplateSchema = z.object({
+  sourcePlanId: z.string().min(1),
+  name: z.string().min(1).max(100),
+});
+
+export type CreateLessonPlanInput = z.infer<typeof createLessonPlanSchema>;
+export type UpdateLessonPlanContentInput = z.infer<typeof updateLessonPlanContentSchema>;