adapter(cloudflare): add supports for the new assets feature

examples/cloudflare-worker/src/index.ts

@@ -1,7 +1,5 @@
 import { serve } from "bknd/adapter/cloudflare";
 
-import manifest from "__STATIC_CONTENT_MANIFEST";
-
 export default serve({
    app: (args) => ({
       connection: {
@@ -13,6 +11,5 @@ export default serve({
    }),
    onBuilt: async (app) => {
       app.modules.server.get("/custom", (c) => c.json({ hello: "world" }));
-   },
-   manifest
+   }
 });