fix(textbooks): 规范核查修复 — 安全漏洞+功能缺失+i18n+类型安全

安全：createPrerequisiteAction 补充 prerequisiteKpId 归属校验；deletePrerequisiteAction 补充双知识点归属校验，防止跨教材越权。

功能：实现图谱添加/删除前置依赖（Dialog + Select 选择知识点 + 调用 Server Action + 自动刷新图谱），替换原 no-op 回调。

i18n：修复 8 处硬编码英文字符串（textbook-reader/chapter-sidebar-list/textbook-card/textbook-form-dialog/textbook-settings-dialog/create-chapter-dialog/teacher-textbook-reader），新增 saveFailed/createFailed/updateFailed/deleteFailed/questionCreatorDefaultContent 等 key。

类型安全：graph-prerequisite-edge.tsx 使用 GraphEdgeData 类型经 unknown 安全转换，替代裸 as 断言。

规范：analytics.tsx 移动 use client 指令到文件第一行；同步架构文档 005 JSON 类型定义（GraphNodeData/GraphEdgeData/MasteryLevel）。

验证：教材模块 lint 零错误、tsc 零错误、193 个单元测试全部通过。

src/modules/textbooks/components/knowledge-graph.tsx

@@ -14,13 +14,34 @@ import {
 } from "@xyflow/react"
 import "@xyflow/react/dist/style.css"
 import { useTranslations } from "next-intl"
+import { toast } from "sonner"
 import { Share2 } from "lucide-react"
 import { usePermission } from "@/shared/hooks/use-permission"
 import { Permissions } from "@/shared/types/permissions"
 import { EmptyState } from "@/shared/components/ui/empty-state"
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/shared/components/ui/select"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/shared/components/ui/dialog"
+import { Button } from "@/shared/components/ui/button"
 import type { GraphViewMode, GraphNodeData } from "../types"
 import { computeGraphLayout } from "../graph-layout"
 import { useGraphData } from "../hooks/use-graph-data"
+import {
+  createPrerequisiteAction,
+  deletePrerequisiteAction,
+} from "../actions"
 import { GraphKpNode } from "./graph-kp-node"
 import { GraphPrerequisiteEdge } from "./graph-prerequisite-edge"
 import { GraphToolbar } from "./graph-toolbar"
@@ -51,8 +72,12 @@ function KnowledgeGraphInner({ textbookId, initialViewMode = "structure" }: Know
   const [viewMode, setViewMode] = useState<GraphViewMode>(initialViewMode)
   const [searchText, setSearchText] = useState("")
   const [selectedKpId, setSelectedKpId] = useState<string | null>(null)
+  // 添加前置依赖对话框状态
+  const [addPrereqOpen, setAddPrereqOpen] = useState(false)
+  const [newPrereqId, setNewPrereqId] = useState<string>("")
+  const [isSavingPrereq, setIsSavingPrereq] = useState(false)
 
-  const { data, isLoading, error } = useGraphData(textbookId, viewMode)
+  const { data, isLoading, error, reload } = useGraphData(textbookId, viewMode)
 
   const availableViewModes: GraphViewMode[] = isTeacher
     ? ["structure", "class-mastery"]
@@ -173,6 +198,51 @@ function KnowledgeGraphInner({ textbookId, initialViewMode = "structure" }: Know
     reactFlow.fitView({ nodes: [{ id: kpId }], duration: 300 })
   }, [reactFlow])
 
+  // 添加前置依赖
+  const handleAddPrerequisite = useCallback(async () => {
+    if (!selectedKpId || !newPrereqId || !textbookId) return
+    setIsSavingPrereq(true)
+    const formData = new FormData()
+    formData.set("knowledgePointId", selectedKpId)
+    formData.set("prerequisiteKpId", newPrereqId)
+    formData.set("textbookId", textbookId)
+    const result = await createPrerequisiteAction(formData)
+    setIsSavingPrereq(false)
+    if (result.success) {
+      toast.success(t("graph.detail.prerequisiteAdded"))
+      setAddPrereqOpen(false)
+      setNewPrereqId("")
+      reload()
+    } else {
+      toast.error(result.message)
+    }
+  }, [selectedKpId, newPrereqId, textbookId, t, reload])
+
+  // 删除前置依赖
+  const handleRemovePrerequisite = useCallback(async (prereqId: string) => {
+    if (!selectedKpId || !textbookId) return
+    const formData = new FormData()
+    formData.set("knowledgePointId", selectedKpId)
+    formData.set("prerequisiteKpId", prereqId)
+    formData.set("textbookId", textbookId)
+    const result = await deletePrerequisiteAction(formData)
+    if (result.success) {
+      toast.success(t("graph.detail.prerequisiteRemoved"))
+      reload()
+    } else {
+      toast.error(result.message)
+    }
+  }, [selectedKpId, textbookId, t, reload])
+
+  // 可选的前置知识点（排除自身和已是前置的）
+  const availablePrereqs = useMemo(() => {
+    if (!data || !selectedKpId) return []
+    const existing = new Set(data.knowledgePoints.find((kp) => kp.id === selectedKpId)?.prerequisiteIds ?? [])
+    return data.knowledgePoints.filter((kp) =>
+      kp.id !== selectedKpId && !existing.has(kp.id),
+    )
+  }, [data, selectedKpId])
+
   if (isLoading && !data) {
     return (
       <div className="h-full flex items-center justify-center text-sm text-muted-foreground">
@@ -255,15 +325,44 @@ function KnowledgeGraphInner({ textbookId, initialViewMode = "structure" }: Know
             textbookId={textbookId}
             onClose={() => setSelectedKpId(null)}
             onJumpToKp={onJumpToKp}
-            onAddPrerequisite={() => {
-              // 后续迭代：打开添加前置对话框
-            }}
-            onRemovePrerequisite={(_prereqId: string) => {
-              // 后续迭代：调用 deletePrerequisiteAction
-            }}
+            onAddPrerequisite={() => setAddPrereqOpen(true)}
+            onRemovePrerequisite={handleRemovePrerequisite}
           />
         </div>
       )}
+
+      {/* 添加前置依赖对话框 */}
+      <Dialog open={addPrereqOpen} onOpenChange={setAddPrereqOpen}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>{t("graph.detail.addPrerequisiteTitle")}</DialogTitle>
+            <DialogDescription>{t("graph.detail.addPrerequisiteDesc")}</DialogDescription>
+          </DialogHeader>
+          <Select value={newPrereqId} onValueChange={setNewPrereqId}>
+            <SelectTrigger>
+              <SelectValue placeholder={t("graph.detail.selectPrerequisite")} />
+            </SelectTrigger>
+            <SelectContent>
+              {availablePrereqs.map((kp) => (
+                <SelectItem key={kp.id} value={kp.id}>
+                  {kp.name}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setAddPrereqOpen(false)}>
+              {t("graph.detail.cancel")}
+            </Button>
+            <Button
+              onClick={handleAddPrerequisite}
+              disabled={!newPrereqId || isSavingPrereq}
+            >
+              {isSavingPrereq ? t("graph.detail.saving") : t("graph.detail.confirm")}
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
     </div>
   )
 }