[External] Synty Polygon 외부 에셋 패키지 추가

Ultraworked with [Sisyphus](https://github.com/code-yeonggu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Assets/External/SyntyPackageHelper/Editor/SyntyPackageHelperConfig.cs

@@ -0,0 +1,27 @@
+#if UNITY_EDITOR
+using UnityEngine;
+using UnityEditor;
+
+[CustomEditor(typeof(SyntyPackageHelperConfig))]
+public class ExamplePackConfigLoaderEditor : Editor
+{
+    public override void OnInspectorGUI()
+    {
+        DrawDefaultInspector();
+
+        SyntyPackageHelperConfig config = (SyntyPackageHelperConfig)target;
+        if (GUILayout.Button("Install Packages"))
+        {
+            SyntyPackageHelper.ProcessConfigs(new SyntyPackageHelperConfig[] { config }, true);
+        }
+    }
+}
+
+[CreateAssetMenu(fileName = "SyntyPackageHelperConfig", menuName = "Scriptable Objects/SyntyPackageHelperConfig")]
+public class SyntyPackageHelperConfig : ScriptableObject
+{
+    public string assetPackDisplayName;
+    public string[] packageIds;
+    public bool hasPromptedUser;
+}
+#endif