feat(ui): 更新品牌启动页与选集交互

lib/core/data/services/catalog_controller.dart

@@ -18,6 +18,9 @@ class CatalogController extends ChangeNotifier {
 
   HomeFeed feed = const HomeFeed();
   bool loading = false;
+
+  /// 第一次首页请求结束后为 true。之后的重试不再回到开屏。
+  bool settled = false;
   String? error;
 
   List<Drama> get dramas => feed.dramas;
@@ -36,6 +39,7 @@ class CatalogController extends ChangeNotifier {
       error = 'catalogError';
     } finally {
       loading = false;
+      settled = true;
       notifyListeners();
     }
   }