CHULA VISTA, Calif. — As the number of deaths among homeless people rises, the Chula Vista nonprofit Community Through Hope plans to launch a street medicine team this summer to improve the health, or even save the lives, of people living without shelter in the South Bay. For some, it’s already too late. “His name was Eric,” said Bella Martinez, program manager for the nonprofit, as she recalled a 47-year-old man who lived at Harborside Park in Chula Vista. Eric had health problems, and his friends called 911 last month when he was having trouble breathing. Martinez said paramedics were not ab…