Move build system from setuptools to uv, wire uv into CI/CD
Convert both pyproject.toml files to the uv_build backend and turn the repo into a proper uv workspace (plotstyle moved to src layout, since uv_build requires the module in its own subdirectory). Dev tooling moves from an optional-dependencies extra to a dependency-group, and plotstyle's matplotlib dependency is now its own rather than a gallery "plotting" extra. Gitea Actions workflows and the Dockerfile now use astral-sh/setup-uv, uv sync, uv run, uv build, and uv publish throughout instead of pip, build, and twine. Also fixes .dockerignore, which was excluding uv.lock, deploy/, and README.md and would have broken even the previous Dockerfile's COPY of deploy/entrypoint.sh. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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