feat(app): 多页面动态化 — 搜索/资料/教师/贴纸库/模板/日历

- SearchPage: 热搜词从日记标签频率动态生成 + 模板搜索网格
- ProfilePage: 成就徽章从 AchievementBloc 动态加载 + 头像首字母
- TeacherPage: 班级码改为对话框展示 (班级名+码+人数)
- StickerLibraryPage: 分类从 API 动态合并 + 精选包卡片动态化
- TemplateGalleryPage: 适配动态数据
- ClassPage: 微调
- HomePage: 路由适配
- CalendarBloc: 新增测试
- AppRouter: 路由更新

app/lib/core/routing/app_router.dart

@@ -42,6 +42,7 @@ import '../../features/templates/views/template_gallery_page.dart';
 import '../../features/settings/views/settings_page.dart';
 import '../../features/auth/bloc/auth_bloc.dart';
 import '../../features/search/bloc/search_bloc.dart';
+import '../../features/discover/bloc/discover_bloc.dart';
 import '../../data/repositories/journal_repository.dart';
 import '../../data/remote/api_client.dart';
 
@@ -168,7 +169,13 @@ GoRouter createAppRouter(AuthBloc authBloc) {
           GoRoute(
             path: '/discover',
             name: 'discover',
-            builder: (context, state) => const DiscoverPage(),
+            builder: (context, state) {
+              return BlocProvider(
+                create: (_) => DiscoverBloc(api: context.read<ApiClient>())
+                  ..add(const DiscoverLoadData()),
+                child: const DiscoverPage(),
+              );
+            },
           ),
           // 个人中心
           GoRoute(