故事项新建调整，上传图像增加缩略图

timeline-component-common/src/main/java/com/timeline/common/response/ResponseEnum.java

@@ -28,7 +28,8 @@ public enum ResponseEnum {
     GATEWAY_TIMEOUT(504, "网关超时"),
 
     // 操作错误
-    SEARCH_ERROR(4001, "查询数据库错误");
+    SEARCH_ERROR(4001, "查询数据库错误"),
+    NOT_FOUND_ERROR(4002, "未找到该资源");
 
     private final int code;
     private final String message;