feat(category): 分类频道接入榜单快照

lib/core/data/remote/category_api.dart

@@ -1,6 +1,7 @@
 // Author: fruit.com.cn
 
 import '../models/content_category.dart';
+import '../models/category_ranking.dart';
 import '../models/drama.dart';
 import '../models/page_result.dart';
 import 'api_client.dart';
@@ -30,11 +31,14 @@ class CategoryApi {
   }) async {
     final data = await _client.get(
       '/app/categories/$categoryId/dramas',
-      query: {
-        'pageIndex': '$pageIndex',
-        'pageSize': '$pageSize',
-      },
+      query: {'pageIndex': '$pageIndex', 'pageSize': '$pageSize'},
     );
     return PageResult.parse(data, Drama.fromCardJson);
   }
+
+  /// 推荐榜快照，服务端已确定内容顺序和连续排名。
+  Future<CategoryRanking> ranking(String categoryId) async {
+    final data = await _client.get('/app/categories/$categoryId/ranking');
+    return CategoryRanking.fromJson(ResponseDecoders.asMap(data));
+  }
 }