Phase 3 completed: Flutter MVP with live streaming and auto-refresh

frontend/lib/providers/settings_provider.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class SettingsProvider with ChangeNotifier {
+  // Default server address for local development.
+  // Using 10.0.2.2 for Android emulator or localhost for Desktop.
+  String _baseUrl = "http://localhost:8080";
+  
+  String get baseUrl => _baseUrl;
+
+  SettingsProvider() {
+    _loadSettings();
+  }
+
+  void _loadSettings() async {
+    final prefs = await SharedPreferences.getInstance();
+    _baseUrl = prefs.getString('baseUrl') ?? _baseUrl;
+    notifyListeners();
+  }
+
+  void setBaseUrl(String url) async {
+    _baseUrl = url;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString('baseUrl', url);
+    notifyListeners();
+  }
+  
+  // Also provide the RTMP URL based on the same hostname
+  String get rtmpUrl {
+    final uri = Uri.parse(_baseUrl);
+    return "rtmp://${uri.host}:1935/live";
+  }
+}