feat: add missing backend route and frontend utility/config files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/src/lib/utils.js

@@ -0,0 +1,5 @@
+import { clsx } from "clsx";
+import { twMerge } from "tailwind-merge";
+export function cn(...inputs) {
+    return twMerge(clsx(inputs));
+}