Forty years ago, Vijay Selhi, who was born and raised in India, started working at a McDonald’s restaurant in Somerville for $3 an hour. Today, he and his sons Cherag and Anurag own and operate 19 McDonald’s locations in greater Boston, including three in Dorchester. For the Selhis, this accumulation of riches is less about selling tens of millions of Big Macs and French