The euro-zone economy is down but not out after a year battered by freezing weather, trade wars, budget disputes and car trouble. The exuberance of 2017 — when the bloc enjoyed a brief “euroboom” — has given way to slowing momentum and an onslaught of bad news. Germany’s supposed powerhouse economy contracted over the summer, and Italy is not only shrinking but also reviving memories of the regional debt crisis. European automakers are wondering if they’re next to be targeted by U.S. import tariffs.Purchasing managers surveys show the deterioration continuing. Italy is close to a triple-dip recession, and its benchmark stock index has dropped 12 percent in six months. The Stoxx Europe 600 is down 10 percent.