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/modules/textbooks/components/knowledge-point-dialogs.tsx

@@ -1,5 +1,7 @@
 "use client"
 
+import type { ReactNode } from "react"
+import { useTranslations } from "next-intl"
 import type { KnowledgePoint } from "../types"
 import { Button } from "@/shared/components/ui/button"
 import {
@@ -13,9 +15,20 @@ import {
 import { Input } from "@/shared/components/ui/input"
 import { Label } from "@/shared/components/ui/label"
 import { Textarea } from "@/shared/components/ui/textarea"
-import { CreateQuestionDialog } from "@/modules/questions/components/create-question-dialog"
 
-interface KnowledgePointDialogsProps {
+/**
+ * 题目创建器的渲染接口。
+ *
+ * 通过 render prop 注入，避免 textbooks 模块直接 import questions 模块组件（P0-1 解耦）。
+ * 页面层负责传入实际的 CreateQuestionDialog 实现。
+ */
+export interface QuestionCreatorRenderProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  targetKp: KnowledgePoint | null
+}
+
+export interface KnowledgePointDialogsProps {
   // Create KP dialog
   createDialogOpen: boolean
   setCreateDialogOpen: (open: boolean) => void
@@ -30,10 +43,16 @@ interface KnowledgePointDialogsProps {
   isUpdatingKp: boolean
   onUpdateKnowledgePoint: (formData: FormData) => Promise<void>
 
-  // Question dialog
+  // Question dialog（通过 render prop 注入，解耦 questions 模块）
   questionDialogOpen: boolean
   setQuestionDialogOpen: (open: boolean) => void
   targetKpForQuestion: KnowledgePoint | null
+  /**
+   * 题目创建器渲染函数。
+   * 由页面层注入实际的 questions 模块组件，模块内部不直接 import questions。
+   * 若不传则不渲染题目创建入口（学生端等无权限场景）。
+   */
+  renderQuestionCreator?: (props: QuestionCreatorRenderProps) => ReactNode
 }
 
 export function KnowledgePointDialogs({
@@ -50,34 +69,35 @@ export function KnowledgePointDialogs({
   questionDialogOpen,
   setQuestionDialogOpen,
   targetKpForQuestion,
+  renderQuestionCreator,
 }: KnowledgePointDialogsProps) {
+  const t = useTranslations("textbooks.dialog.knowledge")
+
   return (
     <>
       <Dialog open={createDialogOpen} onOpenChange={setCreateDialogOpen}>
         <DialogContent>
           <DialogHeader>
-            <DialogTitle>添加知识点</DialogTitle>
-            <DialogDescription>
-              从选中的文本创建知识点。
-            </DialogDescription>
+            <DialogTitle>{t("createTitle")}</DialogTitle>
+            <DialogDescription>{t("createDesc")}</DialogDescription>
           </DialogHeader>
           <form action={onCreateKnowledgePoint as (formData: FormData) => void}>
             <div className="grid gap-4 py-4">
               <div className="grid gap-2">
-                <Label htmlFor="name">名称</Label>
+                <Label htmlFor="name">{t("name")}</Label>
                 <Input id="name" name="name" defaultValue={selectedText} required />
               </div>
               <div className="grid gap-2">
-                <Label htmlFor="description">描述（可选）</Label>
-                <Textarea id="description" name="description" placeholder="请输入描述..." />
+                <Label htmlFor="description">{t("description")}</Label>
+                <Textarea id="description" name="description" placeholder={t("descriptionPlaceholder")} />
               </div>
             </div>
             <DialogFooter>
               <Button type="button" variant="outline" onClick={() => setCreateDialogOpen(false)} disabled={isCreating}>
-                取消
+                {t("cancel")}
               </Button>
               <Button type="submit" disabled={isCreating}>
-                {isCreating ? "创建中..." : "创建"}
+                {isCreating ? t("creating") : t("create")}
               </Button>
             </DialogFooter>
           </form>
@@ -87,26 +107,32 @@ export function KnowledgePointDialogs({
       <Dialog open={editKpDialogOpen} onOpenChange={setEditKpDialogOpen}>
         <DialogContent>
           <DialogHeader>
-            <DialogTitle>编辑知识点</DialogTitle>
-            <DialogDescription>
-              修改知识点的名称和描述。
-            </DialogDescription>
+            <DialogTitle>{t("editTitle")}</DialogTitle>
+            <DialogDescription>{t("editDesc")}</DialogDescription>
           </DialogHeader>
           <form action={onUpdateKnowledgePoint}>
             <div className="grid gap-4 py-4">
               <div className="grid gap-2">
-                <Label htmlFor="edit-name">显示名称</Label>
+                <Label htmlFor="edit-name">{t("displayName")}</Label>
                 <Input id="edit-name" name="name" defaultValue={editingKp?.name} required />
               </div>
               <div className="grid gap-2">
-                <Label htmlFor="edit-description">描述（可选）</Label>
-                <Textarea id="edit-description" name="description" defaultValue={editingKp?.description || ""} placeholder="请输入描述..." />
+                <Label htmlFor="edit-description">{t("description")}</Label>
+                <Textarea
+                  id="edit-description"
+                  name="description"
+                  defaultValue={editingKp?.description || ""}
+                  placeholder={t("descriptionPlaceholder")}
+                />
               </div>
 
               <div className="space-y-2 border rounded-md p-3 bg-muted/20">
                 <div className="flex items-center justify-between">
-                  <Label htmlFor="edit-anchorText" className="text-muted-foreground text-xs flex items-center gap-1">
-                    高级：关联文本 (影响文中高亮)
+                  <Label
+                    htmlFor="edit-anchorText"
+                    className="text-muted-foreground text-xs flex items-center gap-1"
+                  >
+                    {t("anchorText")}
                   </Label>
                 </div>
                 <div className="pt-2">
@@ -118,31 +144,32 @@ export function KnowledgePointDialogs({
                     className="text-sm font-mono"
                     required
                   />
-                  <p className="text-[10px] text-muted-foreground mt-1">
-                    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。
-                  </p>
+                  <p className="text-[10px] text-muted-foreground mt-1">{t("anchorTextHint")}</p>
                 </div>
               </div>
             </div>
             <DialogFooter>
-              <Button type="button" variant="outline" onClick={() => setEditKpDialogOpen(false)} disabled={isUpdatingKp}>
-                取消
+              <Button
+                type="button"
+                variant="outline"
+                onClick={() => setEditKpDialogOpen(false)}
+                disabled={isUpdatingKp}
+              >
+                {t("cancel")}
               </Button>
               <Button type="submit" disabled={isUpdatingKp}>
-                {isUpdatingKp ? "保存中..." : "保存"}
+                {isUpdatingKp ? t("saving") : t("save")}
               </Button>
             </DialogFooter>
           </form>
         </DialogContent>
       </Dialog>
 
-      <CreateQuestionDialog
-        open={questionDialogOpen}
-        onOpenChange={setQuestionDialogOpen}
-        defaultKnowledgePointIds={targetKpForQuestion ? [targetKpForQuestion.id] : []}
-        defaultContent={targetKpForQuestion ? `Please explain the knowledge point: ${targetKpForQuestion.name}` : ""}
-        defaultType="text"
-      />
+      {renderQuestionCreator?.({
+        open: questionDialogOpen,
+        onOpenChange: setQuestionDialogOpen,
+        targetKp: targetKpForQuestion,
+      })}
     </>
   )
 }