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/colors/page.tsx

@@ -194,7 +194,7 @@ export default function ColorsManagement() {
             <h2 className="text-xl font-bold text-gray-900 dark:text-white mb-6">Admin Panel</h2>
             <nav className="space-y-2">
               <a
-                href="/upadaj/dashboard"
+                href="/dashboard"
                 className="block px-4 py-2 text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700 rounded"
               >
                 Filamenti