Initial commit: COPILOT D6 Flutter keyboard controller

Flutter web app replacing legacy WPF CCTV surveillance keyboard controller.
Includes wall overview, section view with monitor grid, camera input,
PTZ control, alarm/lock/sequence BLoCs, and legacy-matching UI styling.

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

copilot_keyboard/lib/data/models/bridge_event.dart

@@ -0,0 +1,64 @@
+/// Event received from bridge WebSocket
+class BridgeEvent {
+  final String serverId;
+  final DateTime timestamp;
+  final String action;
+  final Map<String, dynamic> params;
+
+  BridgeEvent({
+    required this.serverId,
+    required this.timestamp,
+    required this.action,
+    required this.params,
+  });
+
+  factory BridgeEvent.fromJson(Map<String, dynamic> json, String serverId) {
+    return BridgeEvent(
+      serverId: serverId,
+      timestamp: json['timestamp'] != null
+          ? DateTime.parse(json['timestamp'] as String)
+          : DateTime.now(),
+      action: json['action'] as String? ?? '',
+      params: json['params'] as Map<String, dynamic>? ?? {},
+    );
+  }
+
+  // Specific event type checks
+  bool get isViewerConnected => action == 'ViewerConnected';
+  bool get isViewerCleared => action == 'ViewerCleared';
+  bool get isViewerSelectionChanged => action == 'ViewerSelectionChanged';
+  bool get isEventStarted => action == 'EventStarted';
+  bool get isEventStopped => action == 'EventStopped';
+  bool get isDigitalInput => action == 'DigitalInput';
+  bool get isAlarmQueueNotification => action == 'VCAlarmQueueNotification';
+  bool get isConnectionLost => action == 'ConnectionLost';
+
+  // Viewer events
+  int? get viewer => params['Viewer'] as int?;
+  int? get channel => params['Channel'] as int?;
+  int? get playMode => params['PlayMode'] as int?;
+
+  // Alarm events
+  int? get eventId => params['EventID'] as int?;
+  String? get eventName => params['EventName'] as String?;
+  int? get typeId => params['TypeID'] as int?;
+  int? get foreignKey {
+    final fk = params['ForeignKey'];
+    if (fk is int) return fk;
+    if (fk is String) return int.tryParse(fk);
+    return null;
+  }
+
+  // Digital input
+  int? get contact => params['Contact'] as int?;
+  int? get state => params['State'] as int?;
+
+  // Alarm queue notification
+  int? get notification => params['Notification'] as int?;
+  int? get alarmId => params['AlarmID'] as int?;
+
+  @override
+  String toString() {
+    return 'BridgeEvent($action from $serverId at $timestamp)';
+  }
+}