multicast/broadcast support

lib/models/project.dart

@@ -7,34 +7,54 @@ part 'project.g.dart';
 class Project {
   final String id;
   final String name;
-  final String ipAddress;
+  
+  // Support for multiple IP addresses at project level
+  final List<String> ipAddresses;
+  
+  // Broadcast mode flag for project
+  @JsonKey(defaultValue: false)
+  final bool isBroadcast;
+  
   final int port;
   final List<UdpPackage> packages;
+  
+  // Legacy field for backward compatibility
+  @JsonKey(includeFromJson: true, includeToJson: false)
+  final String? ipAddress;
 
   Project({
     required this.id,
     required this.name,
-    required this.ipAddress,
+    List<String>? ipAddresses,
+    this.isBroadcast = false,
     required this.port,
     required this.packages,
-  });
+    this.ipAddress,
+  }) : ipAddresses = ipAddresses ?? (ipAddress != null ? [ipAddress] : ['127.0.0.1']);
 
-  factory Project.fromJson(Map<String, dynamic> json) =>
-      _$ProjectFromJson(json);
+  factory Project.fromJson(Map<String, dynamic> json) {
+    // Handle migration from old format
+    if (json.containsKey('ipAddress') && !json.containsKey('ipAddresses')) {
+      json['ipAddresses'] = [json['ipAddress']];
+    }
+    return _$ProjectFromJson(json);
+  }
 
   Map<String, dynamic> toJson() => _$ProjectToJson(this);
 
   Project copyWith({
     String? id,
     String? name,
-    String? ipAddress,
+    List<String>? ipAddresses,
+    bool? isBroadcast,
     int? port,
     List<UdpPackage>? packages,
   }) {
     return Project(
       id: id ?? this.id,
       name: name ?? this.name,
-      ipAddress: ipAddress ?? this.ipAddress,
+      ipAddresses: ipAddresses ?? this.ipAddresses,
+      isBroadcast: isBroadcast ?? this.isBroadcast,
       port: port ?? this.port,
       packages: packages ?? this.packages,
     );