NEW DELHI (BLOOMBERG) – India has banned 54 apps it says are of Chinese origin, including Sea Ltd's marquee game Free Fire, citing security concerns, sources have said, in the latest instance of tensions between the two neighbours locked in a protracted border dispute. Sea's stock sank as much as 19 per cent in New York on Monday (Feb 14), the steepest decline on record. The apps banned by the South Asian nation's Ministry of Electronics and Information Technology include those belonging to large China tech firms such as Tencent, Alibaba and NetEase, and are re-branded versions of apps already…