ST. HELENA — Under a magenta-ceilinged banquet tent at the Meadowood Napa Valley resort near St. Helena, the paddles shot up and the prices climbed in rapid-fire fashion at Auction Napa Valley’s showcase live auction. It was an afternoon to enjoy free-flowing wine and bid huge sums on many of Napa County’s finest vintages – and some of the most lavish of throw-in gifts – all for a good cause.