TOKYO (Reuters) – Seiji Ozawa, Japan’s most famous conductor, on Tuesday pledged to return to performing next year, a week after saying he would take time off to recover from a recent spell of bad health that has included bouts of pneumonia. The former Vienna State Opera musical director, 76, who before that was conductor of the Boston Symphony Orchestra, was diagnosed with esophageal cancer in January 2010 and completed treatment later that year. …