Fix contact add failure

lib/models/device_info.dart

@@ -14,9 +14,6 @@ enum ConnectionMode {
   /// Direct BLE connection to MeshCore device (default)
   ble,
 
-  /// Act as SSE server - share BLE device with multiple clients
-  sseServer,
-
   /// Direct TCP/WiFi connection to MeshCore device (port 5000)
   tcp,
 }
@@ -26,8 +23,6 @@ extension ConnectionModeExtension on ConnectionMode {
     switch (this) {
       case ConnectionMode.ble:
         return 'Direct (BLE)';
-      case ConnectionMode.sseServer:
-        return 'Share Device (Server)';
       case ConnectionMode.tcp:
         return 'Direct (WiFi)';
     }
@@ -37,8 +32,6 @@ extension ConnectionModeExtension on ConnectionMode {
     switch (this) {
       case ConnectionMode.ble:
         return 'Direct BLE connection to MeshCore device';
-      case ConnectionMode.sseServer:
-        return 'Share BLE device with multiple clients over network';
       case ConnectionMode.tcp:
         return 'Direct WiFi/TCP connection to MeshCore device';
     }

lib/models/sse_server_config.dart

@@ -1,71 +0,0 @@
-/// 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})';
-  }
-}