refactor(admin): 图片排序

- 调整了 Maven 构建文件中的 artifactId- 优化了图片查询逻辑，先按创建时间降序，再按排序字段降序

ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysPictureServiceImpl.java

@@ -99,7 +99,7 @@ public class SysPictureServiceImpl implements ISysPictureService {
         lqw.in(bo.getFlags() != null, SysPicture::getFlag, Arrays.asList(bo.getFlags().split(",")));
         lqw.between(params.get("beginCreateTime") != null && params.get("endCreateTime") != null,
             SysPicture::getCreateTime ,params.get("beginCreateTime"), params.get("endCreateTime"));
-        lqw.orderByDesc(SysPicture::getSort, SysPicture::getCreateTime);
+        lqw.orderByDesc(SysPicture::getCreateTime, SysPicture::getSort);
         return lqw;
     }