fix: Reorder API routes and update main page layout

- Move /makers/ and /models/ routes before /{car_id} to fix route conflict
- Center Request Vehicle button, move PromoPreference to the right

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/app/page.tsx

@@ -47,20 +47,18 @@ export default function Home() {
         <FilmStripSlider banners={banners} settings={bannerSettings} />
 
         <div className="container mx-auto px-4 py-4 sm:py-8">
-          <div className="flex flex-col lg:flex-row items-center justify-center gap-4 lg:gap-8">
-            {/* Request Vehicle Button */}
+          {/* Request Vehicle Button - Centered */}
+          <div className="flex justify-center mb-6">
             <Link
               href="/vehicle-request"
               className="inline-block bg-yellow-500 text-white font-semibold px-6 py-2.5 sm:px-8 sm:py-3 rounded-lg hover:bg-yellow-600 transition shadow-lg text-sm sm:text-base"
             >
               {t.requestVehicle}
             </Link>
+          </div>
 
-            {/* Divider */}
-            <div className="hidden lg:block w-px h-24 bg-white/30"></div>
-            <div className="lg:hidden w-32 h-px bg-white/30"></div>
-
-            {/* Promo Preference */}
+          {/* Promo Preference - Right aligned */}
+          <div className="flex justify-center lg:justify-end">
             <PromoPreference />
           </div>
         </div>