🔧 chore: add handle oauth endpoint login

shared/widgets/signin/actions/getOauthEndpoint.ts

@@ -0,0 +1,6 @@
+"use client";
+import { backendFetch, BackendResponse } from "@/shared/helper/backendFetch";
+
+export const getOauthEndpoint = async (url: string) => {
+  return (await backendFetch(url)) as BackendResponse<{ endpointUrl: string }>;
+};