feat: direct call download api by cgo dart

ui/flutter/lib/api/model/create_task_batch.dart

@@ -0,0 +1,20 @@
+import 'package:gopeed/api/model/extension.dart';
+import 'package:gopeed/api/model/request.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'create_task_batch.g.dart';
+
+@JsonSerializable()
+class CreateTaskBatch {
+  List<Request> reqs;
+  Option? opt;
+
+  CreateTaskBatch({
+    this.reqs = const [],
+    this.opt,
+  });
+
+  factory CreateTaskBatch.fromJson(Map<String, dynamic> json) =>
+      _$CreateTaskBatchFromJson(json);
+  Map<String, dynamic> toJson() => _$CreateTaskBatchToJson(this);
+}