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/constants/CommonConstants.java

@@ -13,4 +13,5 @@ public class CommonConstants {
 
     public static final int DELETED = 1;
     public static final int NOT_DELETED = 0;
+    public static final String LOW_RESOLUTION_PREFIX = "low_res_";
 }

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;