A few years ago, everyone was bending over backwards to court the young middle class — refined packaging, online delivery, paid memberships, practically stamping "premium" on their foreheads. This year, several major players have suddenly turned around together and dived into communities, working hard for grandma and grandpa's grocery baskets. Leading the charge is Chao Hesuan NB. The name sounds bold, and after a year of operation, they've genuinely backed it up. While other