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/tree.css

@@ -0,0 +1,15 @@
+.item[disabled] .text > ui-icon {
+    padding-right: 4px;
+}
+
+.item[disabled] .text > span {
+    opacity: 0.3;
+}
+
+.new {
+    position: absolute;
+    margin-left: 4px;
+    margin-top: 2px;
+    width: 28px;
+    height: 20px;
+}