feat: space opus

Closes #833

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

lib/models/space_opus/cover.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/foundation.dart';
+
+class Cover {
+  int? height;
+  String? url;
+  int? width;
+  late double ratio;
+
+  Cover({this.height, this.url, this.width, required this.ratio});
+
+  Cover.fromJson(Map<String, dynamic> json) {
+    height = json['height'] as int?;
+    url = json['url'] as String?;
+    width = json['width'] as int?;
+    if (height != null && width != null) {
+      ratio = clampDouble(height! / width!, 0.68, 2.7);
+    } else {
+      ratio = 1;
+    }
+  }
+
+  Map<String, dynamic> toJson() => {
+        'height': height,
+        'url': url,
+        'width': width,
+      };
+}