feat(textbooks): 教材模块审计重构 — 跨模块解耦 + 权限 + i18n + 错误边界 + 纯函数抽取

P0 修复：
- 解耦跨模块 UI 依赖：knowledge-point-dialogs 不再直接 import questions，
  改为 renderQuestionCreator render prop 由页面注入
- 接入 usePermission Hook 替换 canEdit 硬编码
- 全模块 i18n 改造：新增 en/zh-CN 翻译文件，替换所有硬编码文案
- Server Action 资源归属校验：新增 verifyChapterBelongsToTextbook/
  verifyKnowledgePointBelongsToTextbook，在 reorder/update/delete/create 中校验

P1 改进：
- 补齐 Error Boundary：4 个 error.tsx + TextbookSectionErrorBoundary 区块包裹
- 抽取纯函数到 utils.ts/graph-layout.ts/constants.ts 并补单测（26 用例全通过）
- 消除重复组件：删除 knowledge-point-panel/create-knowledge-point-dialog
- 修复类型断言：chapter.children! → 守卫式访问
- 图谱 a11y：添加 role/aria-label/aria-pressed
- 统一删除确认：confirm() → AlertDialog
- 数据范围过滤：getTextbooksWithScope 支持学生端按年级过滤

P2 预留：
- TextbookAnalytics 埋点接口 + Provider + Hook

同步 005 架构数据 JSON：补充 getTextbooksWithScope/verify*/ChapterTreeNode 等

src/shared/i18n/messages/zh-CN/textbooks.json

@@ -0,0 +1,186 @@
+{
+  "list": {
+    "title": "教材",
+    "subtitle": "管理数字课程资源与章节。",
+    "add": "新建教材",
+    "empty": {
+      "withFilters": "没有匹配的教材",
+      "withoutFilters": "暂无教材",
+      "withFiltersDesc": "请尝试清除筛选或调整关键词。",
+      "withoutFiltersDesc": "创建你的第一本教材以开始组织章节。"
+    },
+    "clearFilters": "清除筛选",
+    "chapters": "章节"
+  },
+  "student": {
+    "list": {
+      "title": "教材",
+      "subtitle": "浏览你的课程教材。",
+      "empty": {
+        "withFilters": "没有匹配的教材",
+        "withoutFilters": "暂无教材",
+        "withFiltersDesc": "请尝试清除筛选或调整关键词。",
+        "withoutFiltersDesc": "暂时没有可用的教材。"
+      }
+    },
+    "noUser": "未找到用户",
+    "noUserDesc": "请创建学生用户以查看教材。"
+  },
+  "reader": {
+    "back": "返回教材列表",
+    "tabs": {
+      "chapters": "章节目录",
+      "knowledge": "知识点",
+      "graph": "图谱"
+    },
+    "selectChapter": "请选择一个章节开始阅读。",
+    "selectChapterKnowledge": "请选择一个章节查看知识点。",
+    "selectChapterGraph": "请选择一个章节查看知识图谱。",
+    "emptyKnowledge": "该章节暂无知识点。",
+    "emptyContent": "暂无内容",
+    "editContent": "编辑内容",
+    "cancel": "取消",
+    "save": "保存",
+    "saving": "保存中...",
+    "addKnowledgePoint": "添加知识点",
+    "clickToViewKp": "点击查看知识点详情",
+    "noChapters": "暂无章节",
+    "noChaptersDesc": "这本教材还没有章节。"
+  },
+  "dialog": {
+    "create": {
+      "title": "新建教材",
+      "description": "创建一本新的数字教材。完成后点击保存。",
+      "submit": "保存",
+      "saving": "保存中..."
+    },
+    "settings": {
+      "title": "教材设置",
+      "description": "更新教材信息或删除此教材。",
+      "delete": "删除教材",
+      "deleteConfirmTitle": "确认删除教材？",
+      "deleteConfirmDesc": "此操作无法撤销。将永久删除该教材及其所有章节和知识点。",
+      "save": "保存修改",
+      "processing": "处理中...",
+      "trigger": "设置"
+    },
+    "chapter": {
+      "createTitle": "新建章节",
+      "createDesc": "创建一个新章节或小节。",
+      "submit": "创建章节",
+      "creating": "创建中...",
+      "deleteTitle": "删除章节？",
+      "deleteDesc": "将永久删除 {title}。此操作无法撤销。",
+      "delete": "删除",
+      "deleting": "删除中...",
+      "cannotDeleteWithSubchapters": "无法删除含有子章节的章节",
+      "addSubchapter": "添加子章节",
+      "titlePlaceholder": "例如：第一章：入门"
+    },
+    "knowledge": {
+      "createTitle": "添加知识点",
+      "createDesc": "从选中的文本创建知识点。",
+      "editTitle": "编辑知识点",
+      "editDesc": "修改知识点的名称和描述。",
+      "name": "名称",
+      "description": "描述（可选）",
+      "descriptionPlaceholder": "请输入描述...",
+      "displayName": "显示名称",
+      "anchorText": "高级：关联文本（影响文中高亮）",
+      "anchorTextHint": "修改此字段会改变文中被高亮匹配的文字。通常保持与原文一致。",
+      "create": "创建",
+      "creating": "创建中...",
+      "save": "保存",
+      "saving": "保存中...",
+      "cancel": "取消",
+      "deleteTitle": "确认删除",
+      "deleteDesc": "确定要删除这个知识点吗？此操作无法撤销。",
+      "delete": "删除",
+      "createQuestion": "创建相关题目",
+      "editKp": "编辑知识点",
+      "deleteKp": "删除知识点"
+    }
+  },
+  "field": {
+    "title": "标题",
+    "subject": "学科",
+    "grade": "年级",
+    "publisher": "出版社",
+    "titlePlaceholder": "例如：高等数学",
+    "publisherPlaceholder": "例如：人教社",
+    "subjectPlaceholder": "选择学科",
+    "gradePlaceholder": "选择年级"
+  },
+  "filters": {
+    "searchPlaceholder": "按标题、出版社搜索...",
+    "allSubjects": "全部学科",
+    "allGrades": "全部年级"
+  },
+  "card": {
+    "chapters": "章节",
+    "updated": "更新于",
+    "gradeNA": "暂无年级",
+    "publisherNA": "暂无出版社",
+    "editContent": "编辑内容",
+    "delete": "删除",
+    "moreOptions": "更多操作"
+  },
+  "panel": {
+    "knowledgePoints": "知识点",
+    "noPointsYet": "暂无知识点",
+    "noPointsDesc": "添加知识点以标记本章内容。",
+    "selectChapter": "选择一个章节以管理知识点",
+    "level": "等级"
+  },
+  "subject": {
+    "mathematics": "数学",
+    "physics": "物理",
+    "chemistry": "化学",
+    "biology": "生物",
+    "english": "英语",
+    "history": "历史",
+    "geography": "地理"
+  },
+  "grade": {
+    "grade7": "七年级",
+    "grade8": "八年级",
+    "grade9": "九年级",
+    "grade10": "高一",
+    "grade11": "高二",
+    "grade12": "高三"
+  },
+  "error": {
+    "loadFailed": "教材加载失败",
+    "loadFailedDesc": "加载教材内容时发生错误，请重试。",
+    "retry": "重试"
+  },
+  "action": {
+    "createSuccess": "教材创建成功。",
+    "createFailed": "创建教材失败。",
+    "updateSuccess": "教材更新成功。",
+    "updateFailed": "更新教材失败。",
+    "deleteSuccess": "教材删除成功。",
+    "deleteFailed": "删除教材失败。",
+    "chapterCreateSuccess": "章节创建成功",
+    "chapterCreateFailed": "创建章节失败",
+    "chapterDeleteSuccess": "章节删除成功",
+    "chapterDeleteFailed": "删除章节失败",
+    "contentUpdateSuccess": "内容更新成功",
+    "contentUpdateFailed": "更新内容失败",
+    "kpCreateSuccess": "知识点创建成功",
+    "kpCreateFailed": "创建知识点失败",
+    "kpUpdateSuccess": "知识点更新成功",
+    "kpUpdateFailed": "更新知识点失败",
+    "kpDeleteSuccess": "知识点删除成功",
+    "kpDeleteFailed": "删除知识点失败",
+    "reorderSuccess": "排序已更新",
+    "reorderFailed": "章节排序失败",
+    "fillRequired": "请填写所有必填字段。",
+    "titleRequired": "标题为必填项",
+    "nameRequired": "名称为必填项",
+    "invalidContent": "章节内容数据无效",
+    "errorOccurred": "发生错误",
+    "deleteFailed": "删除失败",
+    "updateFailedGeneric": "更新失败"
+  }
+}