Irresponsive servers can drag indexing for too long

Need to set a timeout for downloading from the web while indexing, currently if a server doesn't respond RepoMan will just hang the indexing thread until it responds.

<img width="493" height="208" alt="Image" src="https://github.com/user-attachments/assets/33ba11cf-2e42-4bc9-b6ea-382194013276" />