refactor(users): lots of auth stuff added to make it more easy to manage users

frontend/src/lib/auth-client.ts

@@ -1,5 +1,10 @@
 import { redirect } from "@tanstack/react-router";
-import { adminClient, genericOAuthClient } from "better-auth/client/plugins";
+import {
+	adminClient,
+	genericOAuthClient,
+	usernameClient,
+} from "better-auth/client/plugins";
+
 import { createAuthClient } from "better-auth/react";
 import { ac, admin, manager, systemAdmin, user } from "./auth-permissions";
 
@@ -16,6 +21,7 @@ export const authClient = createAuthClient({
 			},
 		}),
 		genericOAuthClient(),
+		usernameClient(),
 	],
 	fetchOptions: {
 		onError() {