feat: 백문백답 관련 exception을 추가한다.

src/main/java/com/dnd/accompany/domain/qna100/exception/Qna100AccessDeniedException.java

@@ -0,0 +1,10 @@
+package com.dnd.accompany.domain.qna100.exception;
+
+import com.dnd.accompany.global.common.exception.BusinessException;
+import com.dnd.accompany.global.common.response.ErrorCode;
+
+public class Qna100AccessDeniedException extends BusinessException {
+	public Qna100AccessDeniedException(ErrorCode errorCode) {
+		super(errorCode);
+	}
+}

src/main/java/com/dnd/accompany/domain/qna100/exception/Qna100NotFoundException.java

@@ -0,0 +1,10 @@
+package com.dnd.accompany.domain.qna100.exception;
+
+import com.dnd.accompany.global.common.exception.BusinessException;
+import com.dnd.accompany.global.common.response.ErrorCode;
+
+public class Qna100NotFoundException extends BusinessException {
+	public Qna100NotFoundException(ErrorCode errorCode) {
+		super(errorCode);
+	}
+}

src/main/java/com/dnd/accompany/global/common/response/ErrorCode.java

@@ -38,6 +38,10 @@ public enum ErrorCode {
 	// ---- 동행 신청서 ---- //
 	ACCOMPANY_REQUEST_NOT_FOUND(MatripConstant.NOT_FOUND, "ACCOMPANY_REQUEST-001", "동행 신청서를 찾을 수 없습니다."),
 
+	// ---- 백문백답 ---- //
+	QNA100_NOT_FOUND(MatripConstant.NOT_FOUND, "QNA100-001", "백문백답을 찾을 수 없습니다."),
+	QNA100_ACCESS_DENIED(MatripConstant.FORBIDDEN, "QNA100-002", "백문백답 접근 권한이 없습니다."),
+
 	// ---- 이미지 ---- //
 	IMAGE_NOT_EXISTS(MatripConstant.NOT_FOUND, "IMAGE-001", "이미지를 찾을 수 없습니다."),
 	FILE_IO_EXCEPTION(MatripConstant.INTERNAL_SERVER_ERROR, "IMAGE-002", "파일 생성에 실패했습니다."),