feat: 마이바(MyBar) 킵 해제 기능 추가 (소프트 삭제)

Author: MEOHIN

src/main/java/com/back/domain/mybar/service/MyBarService.java

@@ -68,4 +68,10 @@ public void keep(Long userId, Long cocktailId) {
 
         myBarRepository.save(myBar);
     }
+
+    /** 킵 해제(소프트 삭제) */
+    @Transactional
+    public void unkeep(Long userId, Long cocktailId) {
+        myBarRepository.softDeleteByUserAndCocktail(userId, cocktailId);
+    }
 }