Switch to uv as Python package manager

[JanPetterMG]

Summary

This PR migrates the repository from pip + multiple requirements.txt files to uv for dependency management and locking.

The change consolidates Python configuration and dependencies into a single pyproject.toml located at the repository root, replacing the previous fragmented setup.

Key changes

• Dependency management

  • Replaced four separate requirements.txt files with pyproject.toml.
  • Introduced uv as the package and environment manager.
  • Enables deterministic dependency resolution and locking.

• Project structure

  • Moved pyproject.toml from a subdirectory to the repository root.
  • Simplifies tooling discovery and aligns with standard Python project layouts.

• Tooling configuration

  • Removed ruff.toml.
  • Ruff configuration is now defined inside pyproject.toml.

Benefits

• Single source of truth for dependencies and tooling.
• Locked dependency resolution via uv.
• Reduced configuration fragmentation.
• Improved compatibility with modern Python tooling.

Notes

• Dependency groups replace the previous role of separate requirements.txt files.
• CI and scripts have been updated to install dependencies through uv.

Migration impact

No functional changes to the project itself.
This PR strictly affects dependency management and configuration layout.