feat(image): 메인 라이브 탭에 DownsampledKFImage 적용

- 수평 리스트 HStack → LazyHStack으로 교체해 프리로딩/메모리 개선

SodaLive/Sources/Live/Reservation/LiveReservationItemView.swift

@@ -17,13 +17,11 @@ struct LiveReservationItemView: View {
     var body: some View {
         HStack(spacing: 16) {
             ZStack(alignment: .topLeading) {
-                KFImage(URL(string: item.creatorProfileImage))
-                    .cancelOnDisappear(true)
-                    .resizable()
-                    .scaledToFill()
-                    .frame(width: 100, height: 100, alignment: .top)
-                    .cornerRadius(16)
-                    .clipped()
+                DownsampledKFImage(
+                    url: URL(string: item.creatorProfileImage),
+                    size: CGSize(width: 100, height: 100)
+                )
+                .cornerRadius(16)
                 
                 if item.isPrivateRoom {
                     Image("ic_lock")