Python 3.12 from deadsnakes on Ubuntu 22.04 drops `distutils` from the
stdlib, and Ubuntu's system pip still imports from it — so `pip install`
fails immediately with ModuleNotFoundError: distutils. Switch to the uv
standalone installer, which doesn't need pip at all.
Caught during the first deploy build.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>