BANGKOK, April 30 : Thailand’s economy expanded in the first quarter from the previous three months, supported by domestic demand and exports before the Middle East conflict escalated, but activity is expected to slow, the central bank said on Thursday. Economic activity in March was broadly unchanged from February, underpinned by exports, manufacturing output and government spending,  but spillovers from the Middle East war have started to weigh on momentum, the Bank of Thailand said. • The