🔥(backend) remove setup.py

uv is supporting PEP 517, setup.py file calling setuptools is not needed
anymore.

src/backend/setup.py

@@ -1,7 +0,0 @@
-#!/usr/bin/env python
-"""Setup file for the find module. All configuration stands in the setup.cfg file."""
-# coding: utf-8
-
-from setuptools import setup  # pylint: disable=import-error
-
-setup()