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/domain/entities/camera_lock.dart

@@ -0,0 +1,123 @@
+/// Camera lock entity matching the coordinator's CameraLock model.
+class CameraLock {
+  final int cameraId;
+  final CameraLockPriority priority;
+  final String ownerName;
+  final DateTime ownedSince;
+  final DateTime expiresAt;
+
+  const CameraLock({
+    required this.cameraId,
+    required this.priority,
+    required this.ownerName,
+    required this.ownedSince,
+    required this.expiresAt,
+  });
+
+  factory CameraLock.fromJson(Map<String, dynamic> json) {
+    return CameraLock(
+      cameraId: json['cameraId'] as int? ?? json['CameraId'] as int? ?? 0,
+      priority: CameraLockPriority.fromString(
+          json['priority'] as String? ?? json['Priority'] as String? ?? 'Low'),
+      ownerName:
+          json['ownerName'] as String? ?? json['OwnerName'] as String? ?? '',
+      ownedSince: DateTime.parse(
+          json['ownedSince'] as String? ?? json['OwnedSince'] as String? ?? ''),
+      expiresAt: DateTime.parse(
+          json['expiresAt'] as String? ?? json['ExpiresAt'] as String? ?? ''),
+    );
+  }
+
+  Duration get timeRemaining {
+    final remaining = expiresAt.difference(DateTime.now().toUtc());
+    return remaining.isNegative ? Duration.zero : remaining;
+  }
+
+  bool get isExpiringSoon => timeRemaining.inSeconds <= 60;
+  bool get isExpired => timeRemaining == Duration.zero;
+  bool isOwnedBy(String keyboardId) =>
+      ownerName.toLowerCase() == keyboardId.toLowerCase();
+}
+
+enum CameraLockPriority {
+  none,
+  high,
+  low;
+
+  static CameraLockPriority fromString(String value) {
+    switch (value.toLowerCase()) {
+      case 'high':
+        return CameraLockPriority.high;
+      case 'low':
+        return CameraLockPriority.low;
+      default:
+        return CameraLockPriority.none;
+    }
+  }
+
+  String get name {
+    switch (this) {
+      case CameraLockPriority.high:
+        return 'High';
+      case CameraLockPriority.low:
+        return 'Low';
+      case CameraLockPriority.none:
+        return 'None';
+    }
+  }
+}
+
+enum CameraLockNotificationType {
+  acquired,
+  takenOver,
+  confirmTakeOver,
+  confirmed,
+  rejected,
+  expireSoon,
+  unlocked;
+
+  static CameraLockNotificationType fromString(String value) {
+    switch (value) {
+      case 'Acquired':
+        return CameraLockNotificationType.acquired;
+      case 'TakenOver':
+        return CameraLockNotificationType.takenOver;
+      case 'ConfirmTakeOver':
+        return CameraLockNotificationType.confirmTakeOver;
+      case 'Confirmed':
+        return CameraLockNotificationType.confirmed;
+      case 'Rejected':
+        return CameraLockNotificationType.rejected;
+      case 'ExpireSoon':
+        return CameraLockNotificationType.expireSoon;
+      case 'Unlocked':
+        return CameraLockNotificationType.unlocked;
+      default:
+        return CameraLockNotificationType.acquired;
+    }
+  }
+}
+
+/// Lock notification from the coordinator (sent via WebSocket)
+class CameraLockNotification {
+  final CameraLockNotificationType type;
+  final int cameraId;
+  final String copilotName;
+
+  const CameraLockNotification({
+    required this.type,
+    required this.cameraId,
+    required this.copilotName,
+  });
+
+  factory CameraLockNotification.fromJson(Map<String, dynamic> json) {
+    return CameraLockNotification(
+      type: CameraLockNotificationType.fromString(
+          json['type'] as String? ?? json['Type'] as String? ?? ''),
+      cameraId: json['cameraId'] as int? ?? json['CameraId'] as int? ?? 0,
+      copilotName: json['copilotName'] as String? ??
+          json['CopilotName'] as String? ??
+          '',
+    );
+  }
+}