Adds app whitelabling feature from kmountainflower site dumps

lib/live_info_business_object.dart

@@ -4,17 +4,31 @@ import 'dart:convert';
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 
+import 'generated/app_config.dart';
+
 class LiveInfoBusinessObject extends ChangeNotifier {
   LiveInfoBusinessObject({
-    this.endpoint = const String.fromEnvironment(
-      'KRYZ_LIVE_INFO_URL',
-      defaultValue: 'http://kryz.airtime.pro/api/live-info',
-    ),
+    String? endpoint,
     int refreshIntervalSeconds = 20,
     this.requestTimeout = const Duration(seconds: 8),
-  }) : _refreshIntervalSeconds = refreshIntervalSeconds;
+  })  : _endpointOverride = endpoint,
+        _refreshIntervalSeconds = refreshIntervalSeconds;
 
-  final String endpoint;
+  /// Explicit endpoint passed at construction, if any.
+  final String? _endpointOverride;
+
+  /// The effective polling endpoint: construction override > env var > AppConfig.
+  String get endpoint {
+    final override = _endpointOverride;
+    if (override != null && override.isNotEmpty) {
+      return override;
+    }
+    const envUrl = String.fromEnvironment('KRYZ_LIVE_INFO_URL', defaultValue: '');
+    if (envUrl.isNotEmpty) {
+      return envUrl;
+    }
+    return AppConfig.metadataUrl ?? '';
+  }
   final Duration requestTimeout;
 
   Timer? _pollTimer;
@@ -34,6 +48,10 @@ class LiveInfoBusinessObject extends ChangeNotifier {
   List<RecentPlayedItem> get recentPlayed => List.unmodifiable(_recentPlayed);
 
   Future<void> start() async {
+    // Skip polling if no endpoint is configured
+    if (endpoint.isEmpty && (AppConfig.metadataUrl ?? '').isEmpty) {
+      return;
+    }
     await refresh();
     _restartTimer();
   }