Theo LeggettInternational Business CorrespondentBBCThe recruitment website is jazzy, awash with pictures of happy young workers, and festooned with upbeat mini-slogans such as "insane speed", "infinite curiosity" and "customer obsession".Read a bit lower, and there are promises of perks galore: competitive compensation, free meals, free gym membership, free health and dental care and so on. But then comes the catch.Each job ad contains a warning: "Please don't join if you're not excited about… w...