DX: define developer environment with `uv` #478

Job	Run time
pytest / Determine job matrix	5s
style / Determine skipped pre-commit hooks	6s
doc / nb / Execute and build documentation	1m 40s
doc / linkcheck / Check external links	28s
pytest / Run unit tests (pwa_pages, 3.12, ubuntu-24.04)	48s
style / Run local pre-commit hooks	43s
style / Push changes	0s
doc / Upload to GitHub Pages	0s
	3m 50s

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