feat: update Godot integration and coordinated package dependencies

Runtime/ShrinkDataSaverPlatform.cs

@@ -33,8 +33,28 @@ namespace ShrinkDataSaver
             if (string.IsNullOrWhiteSpace(rootPath))
                 throw new InvalidOperationException("ShrinkDataSaver platform paths are not configured.");
             var storage = new LocalStorageProvider(rootPath);
-            ShrinkSettings.Initialize(storage, System.IO.Path.Combine(rootPath, settingsFileName));
-            ShrinkSave.Initialize(storage, System.IO.Path.Combine(rootPath, "saves"), saveFileExtension, currentSaveVersion);
+            Initialize(storage, rootPath, saveFileExtension, settingsFileName, currentSaveVersion);
+        }
+
+        public static void Initialize(IStorageProvider storage, string? rootPath = null,
+            string saveFileExtension = ".json", string settingsFileName = "settings.json",
+            int currentSaveVersion = 1)
+        {
+            if (storage == null)
+                throw new ArgumentNullException(nameof(storage));
+
+            rootPath ??= Paths?.PersistentDataPath;
+#if UNITY_5_3_OR_NEWER
+            rootPath ??= UnityEngine.Application.persistentDataPath;
+#endif
+            var settingsPath = string.IsNullOrWhiteSpace(rootPath)
+                ? settingsFileName
+                : System.IO.Path.Combine(rootPath, settingsFileName);
+            var savesDir = string.IsNullOrWhiteSpace(rootPath)
+                ? "saves"
+                : System.IO.Path.Combine(rootPath, "saves");
+            ShrinkSettings.Initialize(storage, settingsPath);
+            ShrinkSave.Initialize(storage, savesDir, saveFileExtension, currentSaveVersion);
         }
 
         internal static double TimeSeconds