KUALA LUMPUR, Malaysia — At a coffee shop in Bangsar, an affluent Kuala Lumpur suburb, the lunchtime crowd gossips and checks the news on their smartphones. Making the rounds is a YouTube video in which a bomoh — a local shaman — and two acolytes, sitting on a “magic carpet” in Kuala Lumpur International Airport, perform a ritual to find Malaysia Airlines Flight 370, missing since March 8. At any