claude refactorings, flutter best practices, platform dependent changes, general cleanup

lib/api/webuntis/queries/authenticate/authenticate_params.dart

@@ -0,0 +1,17 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import '../../../api_params.dart';
+
+part 'authenticate_params.g.dart';
+
+@JsonSerializable()
+class AuthenticateParams extends ApiParams {
+
+  String user;
+  String password;
+
+  AuthenticateParams({required this.user, required this.password});
+  factory AuthenticateParams.fromJson(Map<String, dynamic> json) => _$AuthenticateParamsFromJson(json);
+
+  Map<String, dynamic> toJson() => _$AuthenticateParamsToJson(this);
+}