Clean up settings

[AdrianSosic]

Applies two minor changes:

• Bumps attrs to latest release, which allows to undo the alias workaround
• Moves the factory function to the global scope (which I noticed is possible while working on the first point) to improve readability

[Copilot]

Pull request overview

Updates the project’s settings initialization to take advantage of a newer attrs release, removing a previous workaround around Attribute.alias handling and simplifying the default-factory logic used for environment-driven settings.

Changes:

• Bump runtime dependency on attrs to >=26.1.0 (and update lockfile accordingly).
• Refactor the per-field default factory builder into a module-level helper and remove the prior alias fallback workaround.
• Align deprecation messaging / env-var translation to use fld.alias directly.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
uv.lock	Locks attrs to 26.1.0 and updates the dev metadata constraint accordingly.
pyproject.toml	Raises the minimum supported attrs version to >=26.1.0.
baybe/settings.py	Moves the default-factory builder to global scope and relies on Attribute.alias directly for env var naming and deprecation guidance.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.