feat: flutter ui integration

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

@@ -0,0 +1,44 @@
+import 'request.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'resource.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class Resource {
+  Request req;
+  String name;
+  int size;
+  bool range;
+  List<FileInfo> files;
+  Map<String, dynamic>? extra;
+
+  Resource({
+    required this.req,
+    required this.name,
+    required this.size,
+    required this.range,
+    required this.files,
+    this.extra,
+  });
+
+  factory Resource.fromJson(Map<String, dynamic> json) =>
+      _$ResourceFromJson(json);
+  Map<String, dynamic> toJson() => _$ResourceToJson(this);
+}
+
+@JsonSerializable()
+class FileInfo {
+  String name;
+  String path;
+  int size;
+
+  FileInfo({
+    required this.name,
+    required this.path,
+    required this.size,
+  });
+
+  factory FileInfo.fromJson(Map<String, dynamic> json) =>
+      _$FileInfoFromJson(json);
+  Map<String, dynamic> toJson() => _$FileInfoToJson(this);
+}