Migrate from pip to uv

[jaagut]

Summary

Migrate from dependency management via pip --break-system-packages and requirements/ files to uv.

uv is faster than pip and using a venv, we don't risk conflicts with other parts of the OS.

Is your feature request related to a problem?

Describe the solution you'd like

• Migrate over to uv
• Change Makefile/``just accordingly
• Change setup.sh to activate the venv with source-all sa
  • Idea: Change the terminal prompt, once sourced. I don't want it to always show (.venv) or something and we could use it as an indicator for having sourced already. Maybe the prompt could look like:

  🤖 <user>@<host> ׀

Describe alternatives you've considered

[Flova]

This might be interesting as well: https://pixi.sh/latest/tutorials/ros2/
It uses uv under the hood for pypi packages, but is able to make a full ros2 installation with isolated user packages on any system. The only downside is, that not all ros2 packages are available as a binary, so many would need to be build from source or vendored (which should be relativly easy).
It should also enable a unified workspace setup, install with only a few clicks and alias for colcon etc.