chore: resolve final review findings

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

scripts/import_csv.py

@@ -33,7 +33,7 @@ from app.models import TimeSlot, WorkEntry
 DAY_TYPES = {"WORK", "TT", "GARDE", "ASTREINTE", "FORMATION", "RTT", "CONGE", "MALADE", "FERIE"}
 
 
-def main(csv_path: str, config_path: str = None):
+def main(csv_path: str, config_path: str | None = None):
     """Importe les données depuis un fichier CSV vers la base de données."""
 
     # Créer l'application Flask avec la config