docs: update contribution guide and fix tox compatibility with uv

[danfimov]

No description provided.

[Copilot]

Pull request overview

This PR modernizes the testing infrastructure by integrating tox-uv for better compatibility between tox and uv, and enhances the contribution documentation. The changes replace the manual uv integration in tox.ini with a native tox-uv runner configuration in tox.toml format, streamlining the testing workflow. The documentation is also expanded to include guidance on working with VuePress 2 documentation locally.

Key changes:

• Migrates from tox.ini with manual uv commands to tox.toml with tox-uv plugin
• Adds tox-uv>=1.29.0 dependency to enable native uv support in tox
• Updates and expands contribution documentation with documentation workflow instructions

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Adds tox-uv and uv package dependencies with their full metadata and platform-specific wheels
tox.toml	New tox configuration file using TOML format with uv-venv-lock-runner for testing across Python 3.10-3.13
tox.ini	Removes legacy INI-format tox configuration with manual uv commands
pyproject.toml	Adds tox-uv>=1.29.0 to dev dependencies with explanatory comment
docs/contrib.md	Simplifies setup instructions, removes pyenv references, and adds comprehensive VuePress documentation workflow section

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