[BUG] Configuration validation is already running，无法更新订阅

问题描述 / Describe the bug

参见日志。

软件版本 / CVR Version

2.5.1
2.5.2都试过

复现步骤 / To Reproduce

正常安装打开更新订阅

操作系统 / OS

• Windows
• Linux
• MacOS

操作系统版本 / OS Version

Win11

日志(勿上传日志文件，请粘贴日志内容) / Log (Do not upload the log file, paste the log content directly)

[2026-09-15 17:32:18.621] INFO [Config] [订阅更新] 开始下载新的订阅内容
[2026-09-15 17:32:18.852] INFO [Config] [订阅更新] 更新订阅配置成功
[2026-09-15 17:32:18.912] INFO [Config] [订阅更新] 更新内核配置
[2026-09-15 17:32:18.925] INFO [Validate] 验证已在进行中，跳过新的验证请求
[2026-09-15 17:32:18.925] ERROR [Config] [订阅更新] 更新失败: Configuration validation is already running
[2026-09-15 17:32:42.753] INFO [System] Silent updater: download complete
[2026-09-15 17:32:42.820] INFO [System] Update cache written: version=2.5.2, size=46964366 bytes
[2026-09-15 17:32:42.821] INFO [System] Silent updater: v2.5.2 ready for startup install on next launch