chore: upgrade uv requirement to >=0.9.5 and add version constraint

[felipeeeantunes]

Summary

This PR upgrades the uv dependency manager requirement to version >=0.9.5 and adds a version constraint to ensure compatibility across the team.

Changes

• ✅ Added required-version = ">=0.9.5" to [tool.uv] section in pyproject.toml
• ✅ Enabled extra-build-dependencies configuration for flash-attn (requires uv 0.9.5+)
• ✅ Updated environments to support macOS (darwin) in addition to Linux
• ✅ Regenerated uv.lock with updated configuration

Motivation

The extra-build-dependencies feature is needed for proper flash-attn build configuration and is only supported in uv 0.9.5+. Adding a version constraint prevents compatibility issues when team members use older uv versions.

Testing

• ✅ Verified uv 0.9.5 works with the new configuration
• ✅ Successfully synced dependencies with uv sync
• ✅ Lockfile resolved all 431 packages without conflicts

Type of Change

• Bug fix
• Build/infrastructure improvement
• New feature
• Breaking change
• Documentation update

Checklist

• Changes follow Microsoft Open Source Code of Conduct
• Self-review completed
• Commit message follows project conventions

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[ultmaster]

How about cuda dependencies?

I'm not thinking very clear about running agent-lightning on macos. I'd rather be cautious about the maintenance effort.