feat: add Lua runtime storage API

lib/runtime/game/flame_lua_game.dart

@@ -24,6 +24,7 @@ import '../display/runtime_viewport.dart';
 import '../resources/game_resource_manager.dart';
 import '../scripting/runtime_script_services.dart';
 import '../scripting/script_engine.dart';
+import '../storage/runtime_storage_manager.dart';
 import 'runtime_locale.dart';
 import 'runtime_options.dart';
 
@@ -73,6 +74,7 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
   late final PositionComponent _viewportRoot;
   RuntimeNetworkManager? _network;
   RuntimeHostBridgeManager? _hostBridgeManager;
+  RuntimeStorageManager? _storage;
   RuntimeViewportConfig? _viewportConfig;
   late final CommandExecutor _commands;
   RuntimeSession? _session;
@@ -117,6 +119,7 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
       'initialized': true,
       'images': _resources.imagesDebugJson(),
       'audio': _audio.audioDebugJson(),
+      'storage': _storage?.debugJson() ?? const {},
     };
   }
 
@@ -142,6 +145,8 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
         diagnostics: diagnostics,
       );
       _hostBridgeManager = hostBridgeManager;
+      final storage = await RuntimeStorageManager.create(gameId: gameId);
+      _storage = storage;
       final activation =
           await PackageActivationController(
             repository: _packageRepository,
@@ -155,6 +160,7 @@ class FlameLuaGame extends FlameGame with PanDetector, ScrollDetector {
             scriptServices: RuntimeScriptServices(
               network: network,
               hostBridge: hostBridgeManager,
+              storage: storage,
             ),
             store: StablePackageStore(runtimeOptions: runtimeOptions),
             assetFallback: AssetGamePackageRepository(