관리자 멤버 썸네일 업로드 경로 수정

components/admin/AdminMemberForm.vue

@@ -191,12 +191,23 @@ const uploadAvatar = async (event) => {
 
   try {
     const formData = new FormData()
-    formData.append('files', file)
-    const result = await $fetch('/admin/api/uploads', {
-      method: 'POST',
-      body: formData
-    })
-    form.avatarUrl = result.files?.[0]?.url || ''
+    formData.append('file', file)
+    const result = isNewMember.value
+      ? await $fetch('/admin/api/member-avatar', {
+        method: 'POST',
+        body: formData
+      })
+      : await $fetch(`/admin/api/members/${props.member.id}/avatar`, {
+        method: 'POST',
+        body: formData
+      })
+    form.avatarUrl = result.avatarUrl || ''
+
+    if (!isNewMember.value) {
+      emit('saved', result)
+      savedMemberSnapshot.value = serializeMemberPayload()
+      saveMessage.value = '썸네일이 변경되었습니다.'
+    }
   } catch (error) {
     saveError.value = error?.data?.message || '썸네일 업로드에 실패했습니다.'
   } finally {