fix: add back /learning-data menu item

Missing from original menu after regroup. Now 33/33 paths verified.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/config/menu.tsx

@@ -36,6 +36,7 @@ export const adminMenuItems: AdminMenuItem[] = [
 
   {
     name: '学习数据', icon: <ReadOutlined />, children: [
+      { path: '/learning-data', name: '学习数据总览', requiredRole: 'ADMIN' },
       { path: '/learning', name: '学习 Dashboard' },
       { path: '/learning/events', name: '阅读事件' },
       { path: '/learning/sessions', name: '学习会话' },

src/layouts/AdminLayout.tsx

@@ -22,6 +22,7 @@ const breadcrumbMap: Record<string, string> = {
   '/imports': '文档导入',
   '/files': '文件与 COS',
   '/reviews': '复习数据',
+  '/learning-data': '学习数据总览',
   '/learning': '学习数据',
   '/learning/events': '阅读事件',
   '/learning/sessions': '学习会话',