refa: article (#757)

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/dynamics/opus_detail/fallback.dart

@@ -0,0 +1,19 @@
+class Fallback {
+  String? id;
+  int? type;
+
+  Fallback({
+    this.id,
+    this.type,
+  });
+
+  factory Fallback.fromJson(Map<String, dynamic> json) => Fallback(
+        id: json['id'],
+        type: json['type'],
+      );
+
+  Map<String, dynamic> toJson() => {
+        'id': id,
+        'type': type,
+      };
+}