feat(category): 分类频道接入榜单快照

lib/app.dart

@@ -268,7 +268,9 @@ class _LumaDramaAppState extends State<LumaDramaApp> {
   CategoryController _createCategories() {
     final controller = CategoryController(_categoryRepository);
     if (widget.catalogRepository == null) {
-      controller.dramaPageLoader = CategoryApi(_apiClient).dramas;
+      final api = CategoryApi(_apiClient);
+      controller.dramaPageLoader = api.dramas;
+      controller.rankingLoader = api.ranking;
     }
     controller.load();
     return controller;