Fix lint errors

src/capa_de_integracion/exceptions.py

@@ -1,4 +1,7 @@
-class FirestorePersistenceException(Exception):
+"""Custom exceptions for the application."""
+
+
+class FirestorePersistenceError(Exception):
     """Exception raised when Firestore operations fail.
 
     This is typically caught and logged without failing the request.