Add py314 to matrix, clean up some loose ends

[veselosky]

No description provided.

[Copilot]

Pull request overview

This PR adds Python 3.14 to the testing matrix and performs cleanup tasks including removal of the django-rich dependency and updates to dependency management documentation.

Key changes:

• Adds Python 3.14 (py314) to the tox testing matrix
• Removes django-rich dependency from all tox environments (keeping the core rich package)
• Removes the django60-py313 test environment and updates Django 6.0 version specifier
• Updates README documentation for dependency management commands to use modern uv syntax
• Adds tox-uv to development dependencies

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tox.ini	Adds py314 to test matrix, removes django-rich from all environments, removes django60-py313 testenv, updates Django 6.0 version specifier, and adds py314 to gh-actions mapping
pyproject.toml	Adds tox-uv>=1.29.0 to development dependencies for improved tox integration with uv
README.md	Removes django-rich documentation, updates Python version range to 3.10-3.14, clarifies Django 6.0 testing status, and modernizes dependency management commands to use uv add/sync

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