fix: 公告模块第一次修复

src/Application/TakeoutSaaS.Application/App/Tenants/Handlers/RevokeAnnouncementCommandHandler.cs

@@ -52,8 +52,15 @@ public sealed class RevokeAnnouncementCommandHandler(
         announcement.RevokedAt = DateTime.UtcNow;
         announcement.RowVersion = request.RowVersion;
 
-        await announcementRepository.UpdateAsync(announcement, cancellationToken);
-        await announcementRepository.SaveChangesAsync(cancellationToken);
+        try
+        {
+            await announcementRepository.UpdateAsync(announcement, cancellationToken);
+            await announcementRepository.SaveChangesAsync(cancellationToken);
+        }
+        catch (Exception exception) when (exception.GetType().Name == "DbUpdateConcurrencyException")
+        {
+            throw new BusinessException(ErrorCodes.Conflict, "公告已被修改，请刷新后重试");
+        }
 
         // 4. 发布领域事件
         await eventPublisher.PublishAsync(