feat(recite): 完成背诵模块基础框架与核心页面开发

本次提交实现了背诵模块的完整基础链路：
1. 新增词书、背单词接口层与对应数据模型
2. 完成背诵首页、章节列表页等核心页面开发
3. 实现音频播放、加载弹窗等通用组件
4. 配置路由跳转链路，替换旧版缓存传参方案
5. 对齐Vue端业务逻辑与UI样式

lib/core/router/app_router.dart

@@ -22,7 +22,14 @@ import 'package:new_learn/features/my/my_report/report_detail_page.dart';
 import 'package:new_learn/features/my/exam/exam_page.dart';
 import 'package:new_learn/features/my/settings/settings_page.dart';
 import 'package:new_learn/features/my/settings/about_app_page.dart';
+import 'package:new_learn/core/api/lexicon/model.dart';
+import 'package:new_learn/features/recite/chapters_page.dart';
+import 'package:new_learn/features/recite/level_over_page.dart';
+import 'package:new_learn/features/recite/level_start_page.dart';
+import 'package:new_learn/features/recite/levels_page.dart';
+import 'package:new_learn/features/recite/recite_args.dart';
 import 'package:new_learn/features/recite/recite_page.dart';
+import 'package:new_learn/features/recite/textbook_list_page.dart';
 import 'package:new_learn/features/report/report_computation_page.dart';
 import 'package:new_learn/features/report/report_web_view_page.dart';
 import 'package:new_learn/features/report/student_info_page.dart';
@@ -203,6 +210,35 @@ final GoRouter appRouter = GoRouter(
       builder: (_, state) => CaptureListPage(courseId: state.extra as String),
     ),
     GoRoute(path: '/register', builder: (_, _) => const RegisterPage()),
+    // ---------- 背诵模块二级页（不在 ShellBranch 内，push 时不显示 tabbar） ----------
+    // 教材列表
+    GoRoute(
+      path: '/recite/textbooks',
+      builder: (_, _) => const TextbookListPage(),
+    ),
+    // 词汇章节（bookId 走路径参数，替代 Vue 缓存）
+    GoRoute(
+      path: '/recite/chapters/:bookId',
+      builder: (_, state) => ChaptersPage(
+        bookId: int.parse(state.pathParameters['bookId']!),
+      ),
+    ),
+    // 关卡列表（Chapter 对象走 extra）
+    GoRoute(
+      path: '/recite/levels',
+      builder: (_, state) => LevelsPage(chapter: state.extra as Chapter),
+    ),
+    // 答题页（LevelStartArgs 显式传参，替代 curChapterInfo 缓存）
+    GoRoute(
+      path: '/recite/level-start',
+      builder: (_, state) =>
+          LevelStartPage(args: state.extra as LevelStartArgs),
+    ),
+    // 学习小结
+    GoRoute(
+      path: '/recite/level-over',
+      builder: (_, state) => LevelOverPage(args: state.extra as LevelOverArgs),
+    ),
 
     // app_router.dart 的 routes 里加，不用管跳转逻辑
     // GoRoute(path: '/task/:id', builder: (_, _) => const TaskDetailPage()),