NEW YORK — The innocent bystander shot to death in a clash between rival gangs in a Bronx subway station was a hardworking immigrant who dreamed of returning to his wife and children in Mexico. Obed Beltrán-Sánchez planned to return to his home in Mexico next year, where his wife, two children, ages 12 and 7, and parents live, according to Mexican outlet La Silla Rota. “He was very hardworking, an excellent person,” a friend of his in Mexico messaged the Daily News in Spanish. “He faced a tremendous struggle but in short he was a great human being.” The friend, who used to work with him at a p…