"manage deploy" fails with "DSDCommandError: Couldn't find any specified requirements "

I'm trying out django-simple-deploy for the first time, and ran into the above error on my first attempt.

To reproduce the problem:
* Make sure you have a recent version of `uv` installed
* grab this commit https://github.com/offby1/django-chess/commit/27457779cf840a221aee26070823d3cfc57d4bba
* in the top-level directory, type `uv run python manage.py deploy`
* You will see (or at least, I saw) `DSDCommandError: Couldn't find any specified requirements in /blah/blah/blah/django-chess.`

As best I can tell, this is because the `_get_dep_man_approach` function doesn't explicitly check for evidence that `uv` is in use. Perhaps it could generate the file on the fly via `uv pip compile pyproject.toml > requirements.txt`.