feat: MeshCore SAR - Flutter BLE mesh radio companion app

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/models/sse_server_config.dart

@@ -0,0 +1,71 @@
+/// SSE Server Configuration Model
+///
+/// Configuration for the SSE (Server-Sent Events) web server that enables
+/// multiple app instances to share a single MeshCore BLE device.
+class SseServerConfig {
+  /// Server bind address (e.g., "0.0.0.0" for all interfaces, "127.0.0.1" for localhost)
+  final String host;
+
+  /// Server port (default: 12929)
+  final int port;
+
+  /// Whether the SSE server is enabled
+  final bool enabled;
+
+  /// Optional authentication token for basic security
+  /// Clients must include this token in Authorization header
+  final String? authToken;
+
+  const SseServerConfig({
+    this.host = '0.0.0.0',
+    this.port = 12929,
+    this.enabled = false,
+    this.authToken,
+  });
+
+  /// Create a copy with updated fields
+  SseServerConfig copyWith({
+    String? host,
+    int? port,
+    bool? enabled,
+    String? authToken,
+  }) {
+    return SseServerConfig(
+      host: host ?? this.host,
+      port: port ?? this.port,
+      enabled: enabled ?? this.enabled,
+      authToken: authToken ?? this.authToken,
+    );
+  }
+
+  /// Get server URL for clients to connect to
+  String getServerUrl({String? ipAddress}) {
+    final ip = ipAddress ?? host;
+    return 'http://$ip:$port';
+  }
+
+  /// Convert to JSON for persistence
+  Map<String, dynamic> toJson() {
+    return {
+      'host': host,
+      'port': port,
+      'enabled': enabled,
+      'authToken': authToken,
+    };
+  }
+
+  /// Create from JSON
+  factory SseServerConfig.fromJson(Map<String, dynamic> json) {
+    return SseServerConfig(
+      host: json['host'] as String? ?? '0.0.0.0',
+      port: json['port'] as int? ?? 12929,
+      enabled: json['enabled'] as bool? ?? false,
+      authToken: json['authToken'] as String?,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'SseServerConfig(host: $host, port: $port, enabled: $enabled, hasAuth: ${authToken != null})';
+  }
+}