Aug 15 (Reuters) - Gold prices held steady near the key psychological level of $1,800 per ounce on Monday, supported by a pullback in the dollar and U.S. Treasury yields. * Asian shares inched higher with investors anxious to see if Wall Street can sustain its rally as hopes U.S. inflation has peaked will be tested by likely hawkish commentary from the Fed this week. * High domestic prices restrained physical gold demand in India last week, while uncertainty surrounding Taiwan-related developments prompted bullion importers in China to hold off on big purchases.