feat(business): update audit, auth, course-plans, announcements, exams

- audit: update retention.ts, types.ts, audit-retention-settings.tsx

- auth: update actions.ts and types.ts

- course-plans: update actions.ts, course-plan-detail.tsx, template-picker-dialog.tsx,

  add lib/track-event.ts

- announcements: update page.tsx, announcement-list.tsx, announcement-pagination.tsx

- exams: update actions.ts

src/modules/exams/actions.ts

@@ -44,10 +44,11 @@ import {
   successState,
 } from "./actions-helpers"
 
-// Re-export 从拆分文件迁移的导出，保持外部 import 路径不变
+// Re-export 从拆分文件迁移的类型导出，保持外部 import 路径不变
+// 注意：Next.js 16 禁止在 "use server" 文件中 re-export 值（仅允许 async 函数导出），
+// autoMarkExamAction / createExamFromRichEditorAction / updateExamFromRichEditorAction
+// 的值 re-export 已移除，调用方直接从源文件 import。
 export type { AutoMarkResult } from "./ai-pipeline/auto-mark"
-export { autoMarkExamAction } from "./ai-pipeline/auto-mark"
-export { createExamFromRichEditorAction, updateExamFromRichEditorAction } from "./actions-rich-editor"
 export type { AiPreviewData, AiRewriteQuestionData } from "./ai-pipeline"
 
 const ExamCreateSchema = z.object({