♻️(backend) migrate from setuptool to uv_build as build backend

We already migrate from pip to uv to manage our dependencies. We can also
migrate the build backend from setuptool to uv_build.
In the pyproject file, the readme property has been removed, because
uv_build try to read it, but the readme is at the root of the project
and not copied into the Dockerfile instructions. This readme can be used
when the package is published on pypi but it is not the case for Docs.

src/backend/pyproject.toml

@@ -2,8 +2,8 @@
 # impress package
 #
 [build-system]
-requires = ["setuptools"]
-build-backend = "setuptools.build_meta"
+requires = ["uv_build>=0.11.9,<0.12"]
+build-backend = "uv_build"
 
 [project]
 name = "impress"
@@ -21,8 +21,7 @@ classifiers = [
 ]
 description = "Docs is a collaborative text editor designed to address common challenges in knowledge building and sharing."
 keywords = ["Django", "Contacts", "Templates", "RBAC"]
-license = { file = "LICENSE" }
-readme = "README.md"
+license = "MIT"
 requires-python = "~=3.13.0"
 dependencies = [
     "beautifulsoup4==4.14.3",
@@ -97,12 +96,13 @@ dev = [
     "types-requests==2.33.0.20260408",
 ]
 
-[tool.setuptools]
-packages = { find = { where = ["."], exclude = ["tests"] } }
-zip-safe = true
-
-[tool.distutils.bdist_wheel]
-universal = true
+[tool.uv.build-backend]
+module-root = ""
+source-exclude = [
+    "**/tests/**",
+    "**/test_*.py",
+    "**/tests.py",
+]
 
 [tool.ruff]
 exclude = [