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/constants.ts

@@ -0,0 +1,107 @@
+import type { BlockType, TemplateBlockSkeleton, TemplateScope } from "./types";
+
+// block 类型 → 中文默认标题
+export const BLOCK_TYPE_LABELS: Record<BlockType, string> = {
+  objective: "教学目标",
+  key_point: "教学重难点",
+  import: "导入",
+  new_teaching: "新授",
+  consolidation: "巩固练习",
+  summary: "课堂小结",
+  homework: "作业布置",
+  blackboard: "板书设计",
+  text_study: "文本研习",
+  exercise: "练习/作业",
+  rich_text: "自定义环节",
+  reflection: "教学反思",
+};
+
+// 富文本类 block（共享同一编辑组件）
+export const RICH_TEXT_BLOCK_TYPES: BlockType[] = [
+  "objective",
+  "key_point",
+  "import",
+  "new_teaching",
+  "consolidation",
+  "summary",
+  "homework",
+  "blackboard",
+  "rich_text",
+  "reflection",
+];
+
+// 系统预设模板骨架（seed 用）
+export interface SystemTemplateDef {
+  id: string; // 固定 ID，便于幂等
+  name: string;
+  scope: TemplateScope;
+  blocks: TemplateBlockSkeleton[];
+}
+
+export const SYSTEM_TEMPLATES: SystemTemplateDef[] = [
+  {
+    id: "tpl_regular",
+    name: "常规课",
+    scope: "regular",
+    blocks: [
+      { type: "objective", title: "教学目标", hint: "明确本课的知识、能力、情感目标" },
+      { type: "key_point", title: "教学重难点", hint: "标注重点与难点及突破策略" },
+      { type: "import", title: "导入", hint: "情境导入/复习导入/问题导入" },
+      { type: "new_teaching", title: "新授", hint: "核心教学活动设计" },
+      { type: "consolidation", title: "巩固练习", hint: "课堂练习，检验学习效果" },
+      { type: "summary", title: "课堂小结", hint: "归纳本课要点" },
+      { type: "homework", title: "作业布置", hint: "课后作业说明（如需下发请用练习块）" },
+      { type: "blackboard", title: "板书设计", hint: "板书结构示意" },
+    ],
+  },
+  {
+    id: "tpl_review",
+    name: "复习课",
+    scope: "review",
+    blocks: [
+      { type: "objective", title: "复习目标" },
+      { type: "rich_text", title: "知识网络梳理", hint: "构建知识结构图" },
+      { type: "rich_text", title: "典型例题精讲" },
+      { type: "rich_text", title: "变式训练" },
+      { type: "exercise", title: "当堂检测", hint: "purpose 选 class_practice" },
+      { type: "summary", title: "课堂小结" },
+    ],
+  },
+  {
+    id: "tpl_experiment",
+    name: "实验课",
+    scope: "experiment",
+    blocks: [
+      { type: "objective", title: "实验目的" },
+      { type: "rich_text", title: "器材准备" },
+      { type: "rich_text", title: "实验步骤" },
+      { type: "rich_text", title: "观察记录表" },
+      { type: "rich_text", title: "交流讨论" },
+      { type: "summary", title: "课堂小结" },
+    ],
+  },
+  {
+    id: "tpl_inquiry",
+    name: "探究课",
+    scope: "inquiry",
+    blocks: [
+      { type: "rich_text", title: "情境导入" },
+      { type: "rich_text", title: "问题驱动" },
+      { type: "rich_text", title: "小组探究" },
+      { type: "rich_text", title: "成果展示" },
+      { type: "rich_text", title: "归纳提升" },
+    ],
+  },
+  {
+    id: "tpl_blank",
+    name: "空白模板",
+    scope: "blank",
+    blocks: [],
+  },
+];
+
+export const LESSON_PLAN_STATUS_LABELS: Record<string, string> = {
+  draft: "草稿",
+  published: "已发布",
+  archived: "已归档",
+};