[C#]: 正版登录无法写入档案

[Usiki1333]

检查项 / Checklist

• 我已在 Issues 页面 中搜索，确认了这一 Bug 未被提交过 / I have searched the Issues page and confirmed that this bug has not been reported yet.
• 我确认只是全部选中而没有仔细确认就直接提交了这个 Issue，并且同意这个 Issue 可以直接被关闭 / I confirm that I checked all boxes without carefully reading them, and agree that this issue may be closed directly.
• 我确认正在使用当前更新分支的最新版 PCL CE，若不是，此 Issue 可能会被直接关闭（更新方式：启动器 设置-关于-软件更新 检查更新，或在 Releases 页面下载） / I confirm that I am using the latest PCL CE version on the current update channel. If not, this issue may be closed directly. To update, check for updates in Settings → About → Updates, or download the latest version from the Releases page.
• 我确认会详细描述我所遇到的问题，并附上日志和截图，而不是随便填点东西敷衍了事 / I will describe the problem in detail, attach logs and screenshots, and avoid submitting vague or incomplete information.

描述 / Description

正版登录无法写入档案

重现步骤 / Steps to Reproduce

按照要求登录授权返回启动器后，会弹出提示框无法写入档案

日志与附件 / Logs & Attachments

Launch-2026-8-29-134814607.log

[whitecat346]

与 #2687 重复