* European media see Merkel beaten by France, Italy Spain * Even German newspapers say Merkel caved in * Spectacular German retreat follows small concessions recently By Erik Kirschbaum and John Irish BERLIN/PARIS, June 30 (Reuters) - Angela Merkel was portrayed across Europe as the big loser of a euro zone showdown in Brussels after the German chancellor was forced to accept the crisis-fighting measures championed by countries struggling with their debts.