feat(menu): 관리자 선물함 메뉴를 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/menu/MenuService.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.menu
 
 import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberRole
 import org.springframework.stereotype.Service
 
 @Service
@@ -8,6 +9,20 @@ class MenuService(
     private val repository: MenuRepository
 ) {
     fun getMenus(member: Member): List<GetMenuResponse> {
-        return repository.getMenu(member.role)
+        val menus = repository.getMenu(member.role)
+        if (member.role != MemberRole.ADMIN) return menus
+
+        return menus + giftManagementMenu
+    }
+
+    private companion object {
+        val giftManagementMenu = GetMenuResponse(
+            title = "선물함 관리",
+            items = listOf(
+                GetMenuResponse(title = "선물함 리스트", route = "/gift/list"),
+                GetMenuResponse(title = "선물 카테고리", route = "/gift/category"),
+                GetMenuResponse(title = "선물 사이즈", route = "/gift/size")
+            )
+        )
     }
 }