feat: 콘서트 폼에 굿즈 섹션 추가

- 굿즈 이미지 다중 업로드 및 드래그 순서 변경
- 삭제 시 확인 다이얼로그 표시

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

frontend/src/pages/pc/admin/schedules/form/concert/MerchandiseSection.jsx

@@ -0,0 +1,169 @@
+import { useRef, useState } from "react";
+import { motion, AnimatePresence, Reorder } from "framer-motion";
+import { Image, Plus, Trash2, GripVertical } from "lucide-react";
+
+import ConfirmDialog from "@/components/pc/admin/common/ConfirmDialog";
+
+/**
+ * 굿즈 섹션
+ * - 다수의 굿즈 이미지 업로드
+ * - 드래그로 순서 변경
+ */
+function MerchandiseSection({ items, setItems }) {
+  const fileInputRef = useRef(null);
+  const [deleteConfirm, setDeleteConfirm] = useState({
+    isOpen: false,
+    itemId: null,
+    itemName: null,
+  });
+
+  // 이미지 추가
+  const handleFileChange = (e) => {
+    const files = Array.from(e.target.files);
+    if (files.length === 0) return;
+
+    const newItems = files.map((file, i) => {
+      const url = URL.createObjectURL(file);
+      return {
+        id: `md-${Date.now()}-${i}`,
+        file,
+        preview: url,
+      };
+    });
+
+    setItems((prev) => [...prev, ...newItems]);
+
+    // input 초기화
+    e.target.value = "";
+  };
+
+  // 이미지 삭제 시도
+  const handleRemoveItem = (id) => {
+    const item = items.find((it) => it.id === id);
+    setDeleteConfirm({
+      isOpen: true,
+      itemId: id,
+      itemName: item?.file?.name || "이미지",
+    });
+  };
+
+  // 이미지 삭제 실행
+  const confirmRemoveItem = () => {
+    if (deleteConfirm.itemId !== null) {
+      setItems((prev) => {
+        const item = prev.find((it) => it.id === deleteConfirm.itemId);
+        if (item?.preview) {
+          URL.revokeObjectURL(item.preview);
+        }
+        return prev.filter((it) => it.id !== deleteConfirm.itemId);
+      });
+    }
+    setDeleteConfirm({ isOpen: false, itemId: null, itemName: null });
+  };
+
+  return (
+    <>
+      <ConfirmDialog
+        isOpen={deleteConfirm.isOpen}
+        onClose={() =>
+          setDeleteConfirm({ isOpen: false, itemId: null, itemName: null })
+        }
+        onConfirm={confirmRemoveItem}
+        title="이미지 삭제"
+        message={
+          <p>
+            <span className="font-medium">{deleteConfirm.itemName}</span>
+            을(를) 삭제하시겠습니까?
+          </p>
+        }
+        confirmText="삭제"
+        cancelText="취소"
+      />
+
+      <div className="bg-white rounded-2xl border border-gray-100 shadow-sm p-6">
+        <h2 className="text-lg font-bold text-gray-900 mb-6">굿즈</h2>
+
+      <input
+        ref={fileInputRef}
+        type="file"
+        accept="image/*"
+        multiple
+        onChange={handleFileChange}
+        className="hidden"
+      />
+
+      {items.length === 0 ? (
+        <div
+          onClick={() => fileInputRef.current?.click()}
+          className="flex flex-col items-center justify-center py-12 border-2 border-dashed border-gray-200 rounded-xl cursor-pointer hover:border-primary hover:bg-primary/5 transition-colors"
+        >
+          <Image size={36} className="text-gray-300 mb-3" />
+          <p className="text-sm text-gray-400">
+            클릭하여 굿즈 이미지를 추가하세요
+          </p>
+          <p className="text-xs text-gray-300 mt-1">여러 장 선택 가능</p>
+        </div>
+      ) : (
+        <Reorder.Group
+          axis="y"
+          values={items}
+          onReorder={setItems}
+          className="flex flex-col gap-3"
+        >
+          <AnimatePresence initial={false}>
+            {items.map((item, index) => (
+              <Reorder.Item
+                key={item.id}
+                value={item}
+                initial={{ opacity: 0, scale: 0.98, y: -8 }}
+                animate={{ opacity: 1, scale: 1, y: 0 }}
+                exit={{ opacity: 0, scale: 0.98, y: -8 }}
+                transition={{ duration: 0.15, ease: "easeOut" }}
+                className="flex items-center gap-3 p-3 bg-gray-50 rounded-xl"
+              >
+                <div className="cursor-grab active:cursor-grabbing text-gray-300 hover:text-gray-500 transition-colors">
+                  <GripVertical size={18} />
+                </div>
+
+                <div className="w-20 h-20 rounded-lg overflow-hidden flex-shrink-0 bg-gray-200">
+                  <img
+                    src={item.preview}
+                    alt={`굿즈 ${index + 1}`}
+                    className="w-full h-full object-cover"
+                    draggable={false}
+                  />
+                </div>
+
+                <div className="flex-1 min-w-0">
+                  <p className="text-sm text-gray-700 truncate">
+                    {item.file?.name}
+                  </p>
+                  <p className="text-xs text-gray-400 mt-0.5">
+                    {index + 1}번째
+                  </p>
+                </div>
+
+                <button
+                  type="button"
+                  onClick={() => handleRemoveItem(item.id)}
+                  className="p-1.5 text-gray-400 hover:text-red-500 hover:bg-red-50 rounded-lg transition-colors"
+                >
+                  <Trash2 size={16} />
+                </button>
+              </Reorder.Item>
+            ))}
+          </AnimatePresence>
+        </Reorder.Group>
+      )}
+
+      {items.length > 0 && (
+        <p className="text-xs text-gray-400 mt-3">
+          드래그하여 순서를 변경할 수 있습니다. 순서대로 표시됩니다.
+        </p>
+      )}
+      </div>
+    </>
+  );
+}
+
+export default MerchandiseSection;

frontend/src/pages/pc/admin/schedules/form/concert/index.jsx

@@ -11,6 +11,7 @@ import { getMembers } from "@/api/public/members";
 
 import ConcertInfoSection from "./ConcertInfoSection";
 import ScheduleSection from "./ScheduleSection";
+import MerchandiseSection from "./MerchandiseSection";
 
 /**
  * 콘서트 일정 추가 폼
@@ -40,6 +41,9 @@ function ConcertForm() {
     { id: 1, date: "", time: "", venue: null },
   ]);
 
+  // 굿즈 이미지
+  const [merchandiseItems, setMerchandiseItems] = useState([]);
+
   // 로딩 상태
   const [saving, setSaving] = useState(false);
 
@@ -113,6 +117,12 @@ function ConcertForm() {
         {/* 공연 일정 */}
         <ScheduleSection rounds={rounds} setRounds={setRounds} />
 
+        {/* 굿즈 */}
+        <MerchandiseSection
+          items={merchandiseItems}
+          setItems={setMerchandiseItems}
+        />
+
         {/* 버튼 */}
         <div className="flex items-center justify-end gap-4">
           <button