refactor: 공통 응답 DTO를 정상 / 에러로 구분하고 companion object 제거

src/main/java/roomescape/common/dto/response/CommonApiResponse.kt

@@ -0,0 +1,14 @@
+package roomescape.common.dto.response
+
+import com.fasterxml.jackson.annotation.JsonInclude
+import roomescape.common.exception.ErrorType
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+data class CommonApiResponse<T>(
+        val data: T? = null,
+)
+
+data class CommonErrorResponse(
+        val errorType: ErrorType,
+        val message: String = errorType.description
+)

src/main/java/roomescape/common/dto/response/RoomescapeApiResponseKT.kt

@@ -1,33 +0,0 @@
-package roomescape.common.dto.response
-
-import com.fasterxml.jackson.annotation.JsonInclude
-import roomescape.common.exception.ErrorType
-
-
-@JsonInclude(JsonInclude.Include.NON_NULL)
-data class RoomescapeApiResponseKT<T>(
-        val success: Boolean,
-        val data: T? = null,
-        val errorType: ErrorType? = null,
-        val message: String? = null,
-) {
-    companion object {
-
-        @JvmStatic
-        fun <T> success(data: T? = null): RoomescapeApiResponseKT<T> {
-            return RoomescapeApiResponseKT(
-                    success = true,
-                    data = data,
-            )
-        }
-
-        @JvmStatic
-        fun <T> fail(errorType: ErrorType, message: String? = null): RoomescapeApiResponseKT<T> {
-            return RoomescapeApiResponseKT(
-                    success = false,
-                    errorType = errorType,
-                    message = message ?: errorType.description
-            )
-        }
-    }
-}