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/function_button_config.dart

@@ -0,0 +1,77 @@
+/// Configuration for function buttons (F1-F7) per wall.
+/// Loaded from the "functionButtons" section of the config file.
+class FunctionButtonConfig {
+  final Map<String, Map<String, List<FunctionButtonAction>>> walls;
+
+  const FunctionButtonConfig({this.walls = const {}});
+
+  /// Get actions for a specific wall and button.
+  List<FunctionButtonAction> getActions(String wallId, String buttonKey) {
+    return walls[wallId]?[buttonKey] ?? [];
+  }
+
+  /// Check if a button has any actions configured for this wall.
+  bool hasActions(String wallId, String buttonKey) {
+    return getActions(wallId, buttonKey).isNotEmpty;
+  }
+
+  factory FunctionButtonConfig.fromJson(Map<String, dynamic> json) {
+    final wallsJson = json['walls'] as Map<String, dynamic>? ?? {};
+    final walls = <String, Map<String, List<FunctionButtonAction>>>{};
+
+    for (final wallEntry in wallsJson.entries) {
+      final buttonsJson = wallEntry.value as Map<String, dynamic>? ?? {};
+      final buttons = <String, List<FunctionButtonAction>>{};
+
+      for (final buttonEntry in buttonsJson.entries) {
+        final actionsJson = buttonEntry.value as List<dynamic>? ?? [];
+        buttons[buttonEntry.key] = actionsJson
+            .map((a) =>
+                FunctionButtonAction.fromJson(a as Map<String, dynamic>))
+            .toList();
+      }
+
+      walls[wallEntry.key] = buttons;
+    }
+
+    return FunctionButtonConfig(walls: walls);
+  }
+}
+
+/// A single action triggered by a function button press.
+class FunctionButtonAction {
+  final FunctionButtonActionType type;
+  final int viewerId;
+  final int sourceId;
+
+  const FunctionButtonAction({
+    required this.type,
+    required this.viewerId,
+    required this.sourceId,
+  });
+
+  factory FunctionButtonAction.fromJson(Map<String, dynamic> json) {
+    return FunctionButtonAction(
+      type: FunctionButtonActionType.fromString(
+          json['actionType'] as String? ?? ''),
+      viewerId: json['viewerId'] as int? ?? 0,
+      sourceId: json['sourceId'] as int? ?? 0,
+    );
+  }
+}
+
+enum FunctionButtonActionType {
+  crossSwitch,
+  sequenceStart;
+
+  static FunctionButtonActionType fromString(String value) {
+    switch (value.toLowerCase()) {
+      case 'crossswitch':
+        return FunctionButtonActionType.crossSwitch;
+      case 'sequencestart':
+        return FunctionButtonActionType.sequenceStart;
+      default:
+        return FunctionButtonActionType.crossSwitch;
+    }
+  }
+}