Complete Cocos Creator port with level bundles, themes, and tooling.

Adds level prefabs, theme assets, audio, extensions, and deployment scripts for the Unity WebGL migration.

Co-authored-by: Cursor <cursoragent@cursor.com>

extensions/plugin-import-2x/creator/convertor/mtl.ts

@@ -0,0 +1,13 @@
+'use strict';
+import { ImporterBase } from '../common/base';
+import { Material } from "../components/Material";
+
+export class MaterialImporter extends ImporterBase {
+    type: string = 'base';
+    async import(): Promise<boolean> {
+        this._3dMeta.ver = '1.0.9';
+        this._3dMeta.importer = 'material';
+        this._2dTo3dSource = await Material.migrate(this.readJSONSync());
+        return true;
+    }
+}