When Sonya Shakir’s 12-year-old son Charles developed a raging earache just before bedtime last winter, she decided to bypass the emergency room and head to a community center on Cleveland’s East Side. Within 15 minutes of arriving, Charles was lying in a high-tech pod equipped with a wireless stethoscope, blood pressure cuff, thermometer and other medical instruments, watching his mother chat by video with a doctor in a hospital several miles away.