feat(app): 接入首页轮播 banner

test/support/fake_catalog.dart

@@ -4,9 +4,11 @@ import 'package:fruitshorts/core/data/repositories/catalog_repository.dart';
 
 /// 测试用目录数据：三部分区里的短剧，标题与后端演示数据保持一致。
 class FakeCatalogRepository implements CatalogRepository {
-  FakeCatalogRepository({List<Drama>? dramas}) : dramas = dramas ?? demoDramas;
+  FakeCatalogRepository({List<Drama>? dramas, this.banners = const []})
+    : dramas = dramas ?? demoDramas;
 
   final List<Drama> dramas;
+  final List<FeedBanner> banners;
 
   @override
   Future<HomeFeed> fetchHomeFeed() async => _feed();
@@ -20,51 +22,38 @@ class FakeCatalogRepository implements CatalogRepository {
   }
 
   HomeFeed _feed() => HomeFeed(
+    banners: banners,
     sections: [FeedSection(code: 'hot', title: '热门推荐', dramas: dramas)],
   );
 }
 
 final List<Drama> demoDramas = [
-  _drama(
-    'the-signal-demo',
-    'The Signal',
-    'Suspense · Mystery',
-    format: 1,
-  ),
+  _drama('the-signal-demo', 'The Signal', 'Suspense · Mystery', format: 1),
   _drama(
     'city-lights-demo',
     'City Lights & Velvet Nights',
     'Urban Romance',
     format: 8,
   ),
-  _drama(
-    'vengeance-demo',
-    'Vengeance Rising',
-    'Action · Thriller',
-    format: 15,
-  ),
+  _drama('vengeance-demo', 'Vengeance Rising', 'Action · Thriller', format: 15),
 ];
 
-Drama _drama(
-  String id,
-  String title,
-  String genre, {
-  required int format,
-}) => Drama(
-  id: id,
-  title: title,
-  synopsis: '$title synopsis',
-  posterUrl: '/files/$id.png',
-  genre: genre,
-  detailLoaded: true,
-  episodes: [
-    for (var index = 0; index < 7; index++)
-      Episode(
-        id: '$id-${index + 1}',
-        number: index + 1,
-        title: 'Episode ${index + 1}',
-        isFree: true,
-        videoUrl: 'https://example.test/$format-$index.mp4',
-      ),
-  ],
-);
+Drama _drama(String id, String title, String genre, {required int format}) =>
+    Drama(
+      id: id,
+      title: title,
+      synopsis: '$title synopsis',
+      posterUrl: '/files/$id.png',
+      genre: genre,
+      detailLoaded: true,
+      episodes: [
+        for (var index = 0; index < 7; index++)
+          Episode(
+            id: '$id-${index + 1}',
+            number: index + 1,
+            title: 'Episode ${index + 1}',
+            isFree: true,
+            videoUrl: 'https://example.test/$format-$index.mp4',
+          ),
+      ],
+    );