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/ReviewSection.tsx

@@ -124,7 +124,7 @@ function ReviewForm({
         <button
           type="submit"
           disabled={submitting}
-          className="px-3 py-1 bg-blue-600 text-white text-sm rounded hover:bg-blue-700 disabled:opacity-50"
+          className="px-3 py-1 bg-orange-500 text-white text-sm rounded hover:bg-orange-600 disabled:opacity-50"
         >
           {submitting ? "저장 중..." : submitLabel}
         </button>
@@ -225,7 +225,7 @@ export default function ReviewSection({ restaurantId }: ReviewSectionProps) {
           {user && !myReview && !showForm && (
             <button
               onClick={() => setShowForm(true)}
-              className="mb-3 px-3 py-1 bg-blue-600 text-white text-sm rounded hover:bg-blue-700"
+              className="mb-3 px-3 py-1 bg-orange-500 text-white text-sm rounded hover:bg-orange-600"
             >
               리뷰 작성
             </button>