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/components/lesson-plan-editor.tsx

@@ -11,6 +11,7 @@ import {
   saveLessonPlanVersionAction,
   getLessonPlanByIdAction,
 } from "../actions";
+import { useLessonPlanTrackerSafe } from "../providers/lesson-plan-provider";
 import type { BlockType } from "../types";
 import { Button } from "@/shared/components/ui/button";
 import { Plus, Save, History } from "lucide-react";
@@ -49,6 +50,7 @@ export function LessonPlanEditor({
 }: Props) {
   const t = useTranslations("lessonPreparation");
   const editor = useLessonPlanEditor();
+  const tracker = useLessonPlanTrackerSafe();
   const [showVersions, setShowVersions] = useState(false);
   const [showAddMenu, setShowAddMenu] = useState(false);
   const autoSaveTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
@@ -130,8 +132,11 @@ export function LessonPlanEditor({
       content: state.doc,
     });
     state.setSaving(false);
-    if (res.success) state.markSaved();
-  }, []);
+    if (res.success) {
+      state.markSaved();
+      tracker.track("lesson_plan.save", { planId: state.planId, source: "manual" });
+    }
+  }, [tracker]);
 
   // 版本回退后刷新内容（修复 P1-1）
   const handleReverted = useCallback(async () => {