new settings panel for url pickup

lib/services/api_service.dart

@@ -5,17 +5,24 @@ typedef TokenProvider = String? Function();
 typedef UnauthorizedHandler = Future<void> Function();
 
 class ApiService {
-  final String baseUrl;
+  String _baseUrl;
   final http.Client _client;
   final Duration timeout;
   TokenProvider? _getToken;
   UnauthorizedHandler? _onUnauthorized;
 
   ApiService({
-    required this.baseUrl,
+    required String baseUrl,
     http.Client? client,
     this.timeout = const Duration(seconds: 30),
-  }) : _client = client ?? http.Client();
+  })  : _baseUrl = baseUrl,
+        _client = client ?? http.Client();
+
+  String get baseUrl => _baseUrl;
+
+  void setBaseUrl(String url) {
+    _baseUrl = url;
+  }
 
   void setTokenProvider(TokenProvider provider) {
     _getToken = provider;