For the past few days, Tan Zhaohui has seen a familiar sight every time she has returned to her home in the southwestern Chinese city of Chengdu: a mound of packages spilling out of the nearby delivery station.The huge piles of e-commerce parcels have almost become an annual tradition in China over the past few years – a sign that the popular “618” shopping festival is approaching once again.But this year, the piles are noticeably less towering than usual, a reflection of the subdued mood that...