fix(cms): add Payload REST API + GraphQL route handlers, revert to inline serverFunction

apps/cms/src/app/(payload)/layout.tsx

@@ -2,17 +2,26 @@
 /* DO NOT MODIFY IT BECAUSE IT COULD BE REWRITTEN AT ANY TIME. */
 import config from "@payload-config";
 import "@payloadcms/next/css";
-import { RootLayout } from "@payloadcms/next/layouts";
+import type { ServerFunctionClient } from "payload";
+import { handleServerFunctions, RootLayout } from "@payloadcms/next/layouts";
 import React from "react";
 
 import { importMap } from "./admin/importMap.js";
-import { serverFunction } from "./serverFunction";
 import "./custom.scss";
 
 type Args = {
   children: React.ReactNode;
 };
 
+const serverFunction: ServerFunctionClient = async function (args) {
+  "use server";
+  return handleServerFunctions({
+    ...args,
+    config,
+    importMap,
+  });
+};
+
 const Layout = ({ children }: Args) => (
   <RootLayout
     config={config}