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>

assets/scripts/core/ResourcesBundle.ts

@@ -0,0 +1,23 @@
+import { assetManager } from 'cc';
+
+const RESOURCES_BUNDLE = 'resources';
+
+let bundlePromise: Promise<assetManager.Bundle> | null = null;
+
+/** 拆分分包后须先 loadBundle('resources')，resources.load 才可用 */
+export function ensureResourcesBundle(): Promise<assetManager.Bundle> {
+    const existing = assetManager.getBundle(RESOURCES_BUNDLE);
+    if (existing) return Promise.resolve(existing);
+    if (bundlePromise) return bundlePromise;
+    bundlePromise = new Promise((resolve, reject) => {
+        assetManager.loadBundle(RESOURCES_BUNDLE, (err, bundle) => {
+            bundlePromise = null;
+            if (err || !bundle) {
+                reject(err ?? new Error(`bundle "${RESOURCES_BUNDLE}" unavailable`));
+                return;
+            }
+            resolve(bundle);
+        });
+    });
+    return bundlePromise;
+}