refactor(lesson-preparation): V2 审计深度修复 — Server Actions i18n + 错误码模式 + 类型断言清零 + a11y 深度修复 + Tracker 埋点接入

V2-1: 12 个 Server Action 通过 getTranslations 翻译错误消息；Service/DataAccess 层抛出错误码异常（PublishServiceError/LessonPlanDataError），Actions 层通过 PUBLISH_ERROR_KEY_MAP 翻译为 i18n 消息
V2-2: SYSTEM_TEMPLATES name/title 改为 i18n 键，createLessonPlan 接受 translateTitle 函数在服务端翻译后存储到 DB
V2-3: 8 处 as unknown as 断言替换为显式类型映射函数（mapRowToLessonPlan/mapRowToListItem/mapRowToTemplate/mapRowToVersion）+ 类型守卫（isLessonPlanStatus/isTemplateType/isTemplateScope）
V2-4: MiniMap nodeColor 复用 lib/node-summary.ts 的 getNodeColor
V2-5: a11y 深度修复 — lesson-plan-filters/exercise-block/inline-question-editor 的 select 添加 label htmlFor 关联；exercise-block 题目列表改为 ul/li；node-editor 画布添加 role=application + 键盘导航配置
V2-6: Tracker 埋点接入 — 新增 useLessonPlanTrackerSafe hook，在 create/save/publish/revert/duplicate/archive 6 处调用 tracker.track

同步更新架构图 004 和 005 文档

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

@@ -1,5 +1,6 @@
 "use server";
 
+import { getTranslations } from "next-intl/server";
 import { requirePermission, PermissionDeniedError } from "@/shared/lib/auth-guard";
 import { Permissions } from "@/shared/types/permissions";
 import { suggestKnowledgePoints } from "./ai-suggest";
@@ -14,6 +15,7 @@ export async function suggestKnowledgePointsAction(input: {
     suggestions: { id: string; name: string; reason: string }[];
   }>
 > {
+  const t = await getTranslations("lessonPreparation");
   try {
     await requirePermission(Permissions.LESSON_PLAN_READ);
     await requirePermission(Permissions.AI_CHAT);
@@ -26,6 +28,6 @@ export async function suggestKnowledgePointsAction(input: {
   } catch (e) {
     if (e instanceof PermissionDeniedError)
       return { success: false, message: e.message };
-    return { success: false, message: "AI 推荐失败，请检查 AI Provider 配置" };
+    return { success: false, message: t("error.aiSuggest") };
   }
 }