Move dashboard to root level route

- Dashboard now accessible at /dashboard instead of /upadaj/dashboard
- Updated all navigation links to use new /dashboard route
- Login page still at /upadaj, redirects to /dashboard on success
- Colors and requests remain under /upadaj prefix
- Updated test files to reference new dashboard path

app/upadaj/requests/page.tsx

@@ -125,7 +125,7 @@ export default function ColorRequestsAdmin() {
           <h1 className="text-3xl font-bold text-gray-800 dark:text-gray-100">Zahtevi za Boje</h1>
           <div className="space-x-4">
             <Link
-              href="/upadaj/dashboard"
+              href="/dashboard"
               className="px-4 py-2 bg-gray-600 text-white rounded hover:bg-gray-700"
             >
               Inventar