feat: add Lua runtime storage API

lib/runtime/scripting/lua_dardo_script_engine.dart

@@ -8,6 +8,7 @@ import '../models/game_diff.dart';
 import '../models/runtime_event.dart';
 import '../network/runtime_network_manager.dart';
 import '../packages/game_package.dart';
+import '../storage/runtime_storage_manager.dart';
 import 'runtime_script_services.dart';
 import 'script_engine.dart';
 
@@ -166,6 +167,18 @@ class LuaDardoScriptEngine implements ScriptEngine {
     _lua.pushDartFunction(_hostRespond);
     _lua.setField(-2, 'host_respond');
 
+    _lua.pushDartFunction(_storageGet);
+    _lua.setField(-2, 'storage_get');
+
+    _lua.pushDartFunction(_storageSet);
+    _lua.setField(-2, 'storage_set');
+
+    _lua.pushDartFunction(_storageRemove);
+    _lua.setField(-2, 'storage_remove');
+
+    _lua.pushDartFunction(_storageClear);
+    _lua.setField(-2, 'storage_clear');
+
     _lua.setGlobal('runtime');
   }
 
@@ -272,6 +285,43 @@ class LuaDardoScriptEngine implements ScriptEngine {
     return 1;
   }
 
+  int _storageGet(LuaState lua) {
+    final storage = _requireStorage();
+    final key = lua.toStr(1);
+    if (key == null || key.isEmpty) {
+      throw const FormatException('runtime.storage_get(key, defaultValue) requires key');
+    }
+    final defaultValue = _readValue(2);
+    _pushValue(storage.getValue(key, defaultValue));
+    return 1;
+  }
+
+  int _storageSet(LuaState lua) {
+    final storage = _requireStorage();
+    final key = lua.toStr(1);
+    if (key == null || key.isEmpty) {
+      throw const FormatException('runtime.storage_set(key, value) requires key');
+    }
+    final value = _readValue(2);
+    lua.pushBoolean(storage.setValue(key, value));
+    return 1;
+  }
+
+  int _storageRemove(LuaState lua) {
+    final storage = _requireStorage();
+    final key = lua.toStr(1);
+    if (key == null || key.isEmpty) {
+      throw const FormatException('runtime.storage_remove(key) requires key');
+    }
+    lua.pushBoolean(storage.remove(key));
+    return 1;
+  }
+
+  int _storageClear(LuaState lua) {
+    lua.pushBoolean(_requireStorage().clear());
+    return 1;
+  }
+
   RuntimeHostBridgeManager _requireHostBridge() {
     final hostBridge = _services.hostBridge;
     if (hostBridge == null) {
@@ -293,6 +343,14 @@ class LuaDardoScriptEngine implements ScriptEngine {
     return network;
   }
 
+  RuntimeStorageManager _requireStorage() {
+    final storage = _services.storage;
+    if (storage == null) {
+      throw StateError('Runtime storage service is not installed');
+    }
+    return storage;
+  }
+
   String _nextNetworkRequestId(String prefix) {
     _networkRequestCounter += 1;
     return '$prefix:$_networkRequestCounter';