feat(app): 搜索改为调用后端并渲染卡片结果

test/support/fake_catalog.dart

@@ -1,9 +1,11 @@
-import 'package:fruitshorts/core/data/models/drama.dart';
+import 'package:fruitshorts/core/data/models/drama.dart';
 import 'package:fruitshorts/core/data/models/home_feed.dart';
+import 'package:fruitshorts/core/data/models/search_result.dart';
 import 'package:fruitshorts/core/data/repositories/catalog_repository.dart';
+import 'package:fruitshorts/core/data/repositories/search_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 {
+class FakeCatalogRepository implements CatalogRepository, SearchRepository {
   FakeCatalogRepository({List<Drama>? dramas, this.banners = const []})
     : dramas = dramas ?? demoDramas;
 
@@ -21,6 +23,20 @@ class FakeCatalogRepository implements CatalogRepository {
     return dramas.firstWhere((drama) => drama.id == dramaId);
   }
 
+  @override
+  Future<SearchResult> search(
+    String keyword, {
+    int pageIndex = 1,
+    int pageSize = 20,
+  }) async {
+    final query = keyword.trim().toLowerCase();
+    final hits = dramas.where((drama) {
+      final haystack = [drama.title, drama.synopsis, drama.genre].join(' ');
+      return haystack.toLowerCase().contains(query);
+    }).toList();
+    return SearchResult(total: hits.length, list: hits);
+  }
+
   HomeFeed _feed() => HomeFeed(
     banners: banners,
     sections: [FeedSection(code: 'hot', title: '热门推荐', dramas: dramas)],
@@ -45,6 +61,7 @@ Drama _drama(String id, String title, String genre, {required int format}) =>
       synopsis: '$title synopsis',
       posterUrl: '/files/$id.png',
       genre: genre,
+      language: 'id',
       detailLoaded: true,
       episodes: [
         for (var index = 0; index < 7; index++)