feat(lesson-preparation): add anchor canvas design, new blocks, and textbook content node

- Add anchor injector for canvas-based anchor positioning

- Add new block components: blackboard, homework, import, key-point, new-teaching, objective, summary

- Add textbook content node for React Flow canvas

- Update actions (kp, publish, main), data-access (templates, versions, main)

- Update editor, node-editor, block-renderer, and picker components

- Update schema, types, hooks, and lib utilities (document-migration, node-summary, rf-mappers)

src/modules/lesson-preparation/actions-kp.ts

@@ -7,6 +7,7 @@ import {
   getKnowledgePointsByTextbookId,
   getKnowledgePointsByChapterId,
 } from "@/modules/textbooks/data-access";
+import { getKnowledgePointOptionsSchema } from "./schema";
 import type { ActionState } from "./types";
 
 // 加载知识点选项（供客户端知识点选择器使用）
@@ -18,14 +19,19 @@ export async function getKnowledgePointOptionsAction(input: {
 > {
   const t = await getTranslations("lessonPreparation");
   try {
+    const parsed = getKnowledgePointOptionsSchema.safeParse(input);
+    if (!parsed.success) {
+      return { success: false, errors: parsed.error.flatten().fieldErrors };
+    }
+
     await requirePermission(Permissions.LESSON_PLAN_READ);
-    if (!input.textbookId) return { success: true, data: { options: [] } };
+    if (!parsed.data.textbookId) return { success: true, data: { options: [] } };
 
     let kps;
-    if (input.chapterId) {
-      kps = await getKnowledgePointsByChapterId(input.chapterId);
+    if (parsed.data.chapterId) {
+      kps = await getKnowledgePointsByChapterId(parsed.data.chapterId);
     } else {
-      kps = await getKnowledgePointsByTextbookId(input.textbookId);
+      kps = await getKnowledgePointsByTextbookId(parsed.data.textbookId);
     }
     return {
       success: true,