uv

4ea44bec - Ensure cached realm credentials are applied if no password is found for index URL (#13463)

Ensure cached realm credentials are applied if no password is found for index URL (#13463) We were not correctly falling back to cached realm credentials when an index URL was provided with only a username. This came up in a [later comment](https://github.com/astral-sh/uv/issues/13443#issuecomment-2881115301) on #13443 where credentials in a pip extra index in `uv.toml` were being ignored when the same URL (but with only a username) was used at the command line for `--extra-index-url`. I've added a test to catch this case. Closes #13443