feat(lesson-preparation): add readonly view, anchor node selector, and type guards

- Add lesson-plan-readonly-view for viewing published plans

- Add anchor-node-selector and textbook-segments for canvas anchor positioning

- Add i18n-errors and type-guards lib utilities

- Add lesson-plan-provider-setup for provider initialization

- Update actions, data-access (knowledge, versions, main), publish-service

- Update blocks (blackboard, exercise, homework, import, key-point, objective, reflection)

- Update editor, node-editor, node-edit-panel, pickers, and providers

src/modules/lesson-preparation/schema.ts

@@ -1,12 +1,13 @@
 import { z } from "zod";
 
+// V3 修复：Zod 错误消息使用 i18n 键，由 actions 层通过 translateFieldErrors() 翻译
 export const createLessonPlanSchema = z.object({
-  title: z.string().min(1, "请输入课案标题").max(255),
+  title: z.string().min(1, "error.titleRequired").max(255, "error.titleTooLong"),
   textbookId: z.string().optional(),
   chapterId: z.string().optional(),
   subjectId: z.string().optional(),
   gradeId: z.string().optional(),
-  templateId: z.string().min(1, "请选择模板"),
+  templateId: z.string().min(1, "error.templateRequired"),
 });
 
 export const updateLessonPlanContentSchema = z.object({
@@ -47,12 +48,12 @@ export const getKnowledgePointOptionsSchema = z.object({
 // 发布作业输入校验
 const dateStringSchema = z
   .string()
-  .refine((v) => !Number.isNaN(new Date(v).getTime()), "Invalid date format");
+  .refine((v) => !Number.isNaN(new Date(v).getTime()), "error.invalidDate");
 
 export const publishLessonPlanHomeworkSchema = z.object({
   planId: z.string().min(1),
   blockId: z.string().min(1),
-  classIds: z.array(z.string().min(1)).min(1, "至少选择一个班级"),
+  classIds: z.array(z.string().min(1)).min(1, "error.classRequired"),
   availableAt: dateStringSchema.optional(),
   dueAt: dateStringSchema.optional(),
 });