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/static/migrate-resources/chunks/unpack.inc

@@ -0,0 +1,9 @@
+// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
+
+vec3 unpackNormal(vec4 nmap) {
+  return nmap.xyz * 2.0 - 1.0;
+}
+
+vec3 unpackRGBE(vec4 rgbe) {
+  return rgbe.rgb * pow(2.0, rgbe.a * 255.0 - 128.0);
+}