feat: 新增 access-result 删除接口，同时清理存储文件

par-core/src/main/java/com/par/core/service/AccessResultService.java

@@ -43,6 +43,11 @@ public interface AccessResultService {
      */
     List<SiteAccessSummaryDTO> listSiteSummaries();
 
+    /**
+     * 删除访问结果（含存储文件）
+     */
+    void delete(Long id);
+
     /**
      * 批量标记站点某个URL的所有未验证结果为有效/无效
      */

par-core/src/main/java/com/par/core/service/impl/AccessResultServiceImpl.java

@@ -191,6 +191,16 @@ public class AccessResultServiceImpl implements AccessResultService {
         return new ArrayList<>(siteMap.values());
     }
 
+    @Override
+    public void delete(Long id) {
+        AccessResult result = mapper.selectById(id);
+        if (result == null) throw new IllegalArgumentException("访问结果不存在: " + id);
+        // 删除存储文件
+        try { storageService.delete(result.getStoragePath()); } catch (Exception ignored) {}
+        mapper.deleteById(id);
+        log.info("Access result deleted: id={}, siteId={}", id, result.getSiteId());
+    }
+
     @Override
     public int batchValidateUrl(String siteId, String url, Boolean isValid) {
         int affected = mapper.batchValidateUrl(siteId, url, isValid);