NEW YORK (Reuters) - Panera Bread Co on Thursday is launching an $8.99 (£6.96) per month unlimited coffee subscription as it aims to grow its breakfast traffic and loyalty programme membership.The subscription, believed to be a first among national restaurant chains, could position Panera competitively as an industry battle to win over breakfast customers surges this year. "We are disrupting the industry," Panera Chief Executive Officer Niren Chaudhary said in a phone interview. "We don't..