Asia extended a global stocks rally on Friday after the European Central Bank signaled its readiness to inject more stimulus, helping the dollar scale a fresh two-month peak against the euro. MSCI’s broadest index of Asia-Pacific shares outside Japan was up 0.6 percent, on track for a modest weekly loss of about 0.1 percent. Japan’s Nikkei stock index (.N225) was up 2.3 percent, poised to gain more than 3 percent for the week.