[BUG]: 删除种子下载的文件后仍会继续做种而非停止并显示“文件丢失”

Description

如题。

Rayburst Version

3.9.9

Issue Source

Rayburst App

Platform

Windows (x64)

OS Version

Windows 10 Pro 22H2

Steps to Reproduce

1. 下载一个 bt 种子文件，并等待其下载完成。
2. 将文件删除、修改名称或移动到其他位置。
3. Motrix Next 内仍会显示在做种而非预期的“文件丢失”。

Diagnostic Logs

N/A

Screenshots

N/A

Validations

• I have searched existing issues and tested with the latest beta release when possible.
• I have uploaded the exported diagnostic .zip directly, or kept the same ZIP structure after redaction.
• This is a reproducible Rayburst desktop-app bug. Questions belong in GitHub Discussions, browser-extension-only issues belong in rayburst-connect, and engine-only issues belong in aria2-next.