DX: define developer environment with `uv` #473

Job	Run time
pytest / Determine job matrix	7s
style / Determine skipped pre-commit hooks	8s
doc / linkcheck / Check external links	10s
doc / nb / Execute and build documentation	19s
pytest / Run unit tests (pwa_pages, 3.12, ubuntu-24.04)	46s
style / Run local pre-commit hooks	44s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	2m 14s

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