feat: Refactor to use Wolf3dFlutterEngine across the application

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

apps/wolf_3d_gui/lib/main.dart

@@ -1,6 +1,7 @@
 /// Flutter entry point for the GUI host application.
 ///
-/// The GUI bootstraps bundled and discoverable game data through [Wolf3d]
+/// The GUI bootstraps bundled and discoverable game data through
+/// [Wolf3dFlutterEngine]
 /// before presenting the game-selection flow.
 library;
 
@@ -17,7 +18,9 @@ void main() async {
     await windowManager.ensureInitialized();
   }
 
-  final Wolf3d wolf3d = await Wolf3d().init(debug: kDebugMode);
+  final Wolf3dFlutterEngine wolf3d = await Wolf3dFlutterEngine().init(
+    debug: kDebugMode,
+  );
 
   runApp(
     MaterialApp(