clean up models

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

lib/models_new/article/article_view/opus.dart

@@ -1,15 +1,9 @@
 import 'package:PiliPlus/models/dynamics/article_content_model.dart';
 
 class ArticleOpus {
-  int? opusid;
-  int? opussource;
-  String? title;
   List<ArticleContentModel>? content;
 
   ArticleOpus.fromJson(Map<String, dynamic> json) {
-    opusid = json['opus_id'];
-    opussource = json['opus_source'];
-    title = json['title'];
     if (json['content']?['paragraphs'] case List list) {
       content = list.map((i) => ArticleContentModel.fromJson(i)).toList();
     }