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

lib/api/marianumcloud/talk/get_participants/get_participants.dart

@@ -0,0 +1,21 @@
+import 'dart:convert';
+
+import 'package:http/http.dart' as http;
+
+import '../talk_api.dart';
+import 'get_participants_response.dart';
+
+class GetParticipants extends TalkApi<GetParticipantsResponse> {
+  String token;
+  GetParticipants(this.token) : super('v4/room/$token/participants', null);
+
+  @override
+  GetParticipantsResponse assemble(String raw) {
+    final decoded = jsonDecode(raw) as Map<String, dynamic>;
+    return GetParticipantsResponse.fromJson(decoded['ocs'] as Map<String, dynamic>);
+  }
+
+  @override
+  Future<http.Response> request(Uri uri, Object? body, Map<String, String>? headers) => http.get(uri, headers: headers);
+
+}