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/decode-base.inc

@@ -0,0 +1,16 @@
+// Copyright (c) 2017-2020 Xiamen Yaji Software Co., Ltd.
+
+#include <common>
+
+struct StandardVertInput {
+  highp vec4 position;
+  vec3 normal;
+  vec4 tangent;
+  vec4 color;
+  vec2 uv;
+};
+
+layout(location = 0) in vec3 a_position;
+layout(location = 1) in vec3 a_normal;
+layout(location = 2) in vec2 a_texCoord;
+layout(location = 3) in vec4 a_tangent;