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/components/SkinnedMeshUnit.ts

@@ -0,0 +1,59 @@
+'use strict';
+export const SKINNEDMESHUNIT = {
+    "__type__": "cc.SkinnedMeshUnit",
+    "mesh": null,
+    "skeleton": null,
+    "material": null,
+    "_localTransform": {
+        "__type__": "cc.Mat4",
+        "m00": 1,
+        "m01": 0,
+        "m02": 0,
+        "m03": 0,
+        "m04": 0,
+        "m05": 1,
+        "m06": 0,
+        "m07": 0,
+        "m08": 0,
+        "m09": 0,
+        "m10": 1,
+        "m11": 0,
+        "m12": 0,
+        "m13": 0,
+        "m14": 0,
+        "m15": 1,
+    },
+    "_offset": {
+        "__type__": "cc.Vec2",
+        "x": 0,
+        "y": 0,
+    },
+    "_size": {
+        "__type__": "cc.Vec2",
+        "x": 1,
+        "y": 1,
+    },
+};
+
+export class SkinnedMeshUnit {
+
+    static create() {
+        return JSON.parse(JSON.stringify(SKINNEDMESHUNIT));
+    }
+
+    static async migrate(json2D: any) {
+        const source = JSON.parse(JSON.stringify(SKINNEDMESHUNIT));
+        for (const key in json2D) {
+            const value = json2D[key];
+            if (key === '__type__' || value === undefined || value === null) { continue; }
+            source[key] = value;
+        }
+        return source;
+    }
+
+    static async apply(index: number, json2D: any, json3D: any) {
+        const source = await SkinnedMeshUnit.migrate(json2D[index]);
+        json3D.splice(index, 1, source);
+        return source;
+    }
+}