YOUNTVILLE, Calif. — A gunman and three hostages were found dead inside a California home for disabled and aging war veterans yesterday following a daylong standoff.The gunman, who authorities said once served in the U.S. military, opened fire yesterday inside the veterans home where he took three hostages and was holding police at bay as negotiators sought to make contact with him for several hours, authorities said.Police said three female victims and the male gunman were found dead inside the facility.