chore: fix python style violations

Co-authored-by: OpenAI/GPT-5.6-Terra <vibecoder@antoineve.me>
Co-authored-by: OpenAI/GPT-5.6-Luna <vibecoder@antoineve.me>
Co-authored-by: MiniMax/MiniMax-M3 <vibecoder@antoineve.me>
Co-authored-by: DeepSeek/DeepSeek-v4-Flash <vibecoder@antoineve.me>

tests/conftest.py

@@ -1,11 +1,14 @@
 import pytest
-from app import create_app, db as _db
+
+from app import create_app
+from app import db as _db
 
 
 @pytest.fixture
 def app(tmp_path):
     config_path = tmp_path / "config.toml"
-    config_path.write_text("""
+    config_path.write_text(
+        """
 [vehicles.citadine]
 name = "Citadine électrique"
 fuel = "electric"
@@ -59,7 +62,9 @@ forfait = 699
 km_max = 0
 taux = 0.364
 forfait = 0
-""", encoding="utf-8")
+""",
+        encoding="utf-8",
+    )
 
     application = create_app(config_path=str(config_path))
     application.config["TESTING"] = True