feat: use batch download api for create multitasks (#978)

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

@@ -0,0 +1,39 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import 'options.dart';
+import 'request.dart';
+
+part 'create_task_batch.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class CreateTaskBatch {
+  List<CreateTaskBatchItem>? reqs;
+  Options? opt;
+
+  CreateTaskBatch({
+    this.reqs,
+    this.opt,
+  });
+
+  factory CreateTaskBatch.fromJson(
+    Map<String, dynamic> json,
+  ) =>
+      _$CreateTaskBatchFromJson(json);
+
+  Map<String, dynamic> toJson() => _$CreateTaskBatchToJson(this);
+}
+
+@JsonSerializable()
+class CreateTaskBatchItem {
+  Request? req;
+  Options? opts;
+
+  CreateTaskBatchItem({
+    this.req,
+    this.opts,
+  });
+
+  factory CreateTaskBatchItem.fromJson(Map<String, dynamic> json) =>
+      _$CreateTaskBatchItemFromJson(json);
+  Map<String, dynamic> toJson() => _$CreateTaskBatchItemToJson(this);
+}

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

@@ -0,0 +1,55 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'create_task_batch.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+CreateTaskBatch _$CreateTaskBatchFromJson(Map<String, dynamic> json) =>
+    CreateTaskBatch(
+      reqs: (json['reqs'] as List<dynamic>?)
+          ?.map((e) => CreateTaskBatchItem.fromJson(e as Map<String, dynamic>))
+          .toList(),
+      opt: json['opt'] == null
+          ? null
+          : Options.fromJson(json['opt'] as Map<String, dynamic>),
+    );
+
+Map<String, dynamic> _$CreateTaskBatchToJson(CreateTaskBatch instance) {
+  final val = <String, dynamic>{};
+
+  void writeNotNull(String key, dynamic value) {
+    if (value != null) {
+      val[key] = value;
+    }
+  }
+
+  writeNotNull('reqs', instance.reqs?.map((e) => e.toJson()).toList());
+  writeNotNull('opt', instance.opt?.toJson());
+  return val;
+}
+
+CreateTaskBatchItem _$CreateTaskBatchItemFromJson(Map<String, dynamic> json) =>
+    CreateTaskBatchItem(
+      req: json['req'] == null
+          ? null
+          : Request.fromJson(json['req'] as Map<String, dynamic>),
+      opts: json['opts'] == null
+          ? null
+          : Options.fromJson(json['opts'] as Map<String, dynamic>),
+    );
+
+Map<String, dynamic> _$CreateTaskBatchItemToJson(CreateTaskBatchItem instance) {
+  final val = <String, dynamic>{};
+
+  void writeNotNull(String key, dynamic value) {
+    if (value != null) {
+      val[key] = value;
+    }
+  }
+
+  writeNotNull('req', instance.req);
+  writeNotNull('opts', instance.opts);
+  return val;
+}