Unify color scheme: orange primary, rose accent, gray neutral

- Primary (orange): search button, active filters, selected cards,
  channel tags, links, input focus ring
- Accent (rose): favorites/heart only
- Neutral (gray): price tags, inactive buttons
- Semantic colors preserved: red for 폐업, yellow for 임시휴업

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

frontend/src/components/RestaurantList.tsx

@@ -37,7 +37,7 @@ export default function RestaurantList({
           onClick={() => onSelect(r)}
           className={`w-full text-left p-3 rounded-xl shadow-sm border transition-all hover:shadow-md hover:-translate-y-0.5 ${
             selectedId === r.id
-              ? "bg-blue-50 border-blue-300 shadow-blue-100"
+              ? "bg-orange-50 border-orange-300 shadow-orange-100"
               : "bg-white border-gray-100 hover:bg-gray-50"
           }`}
         >
@@ -57,7 +57,7 @@ export default function RestaurantList({
               <span className="px-1.5 py-0.5 bg-gray-100 rounded text-gray-600">{r.cuisine_type}</span>
             )}
             {r.price_range && (
-              <span className="px-1.5 py-0.5 bg-green-50 rounded text-green-700">{r.price_range}</span>
+              <span className="px-1.5 py-0.5 bg-gray-50 rounded text-gray-600">{r.price_range}</span>
             )}
           </div>
           {r.region && (
@@ -83,7 +83,7 @@ export default function RestaurantList({
               {r.channels.map((ch) => (
                 <span
                   key={ch}
-                  className="px-1.5 py-0.5 bg-red-50 text-red-600 rounded-full text-[10px] font-medium"
+                  className="px-1.5 py-0.5 bg-orange-50 text-orange-600 rounded-full text-[10px] font-medium"
                 >
                   {ch}
                 </span>