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/page.tsx

@@ -33,7 +33,7 @@ export default function AdminLogin() {
       trackEvent('Admin', 'Login', 'Success');
 
       // Redirect to admin dashboard using window.location for static export
-      window.location.href = '/upadaj/dashboard';
+      window.location.href = '/dashboard';
     } catch (err: any) {
       setError('Neispravno korisničko ime ili lozinka');
       console.error('Login error:', err);