Add ruff as a development dependency in pyproject.toml and uv.lock; create conftest.py for test configuration

Author: grll

pyproject.toml

@@ -19,6 +19,7 @@ omproxy = "omproxy.cli:main"
 dev = [
     "pytest>=8.3.4",
     "pytest-asyncio>=0.24.0",
+    "ruff>=0.8.2",
 ]
 
 
@@ -31,4 +32,4 @@ asyncio_default_fixture_loop_scope = "function"
 
 [build-system]
 requires = ["hatchling"]
-build-backend = "hatchling.build"
+build-backend = "hatchling.build"