PRISTINA, Kosovo (AP) — Kushtrim Ajvazi is proud to be part of a successful business in one of the poorest countries in Europe. The company where he is a manager produces potato chips and other snacks that can be found in almost every shop in Kosovo and are exported abroad. But Ajvazi’s company faces unplanned challenges because of a steep rise in fuel prices caused by the war in Iran, whose ripple effects have reached this small corner of southeastern Europe. The Pestova company has nearly 100