By Yimou Lee, Sarah Wu and James Pomfret TAIPEI (Reuters) – Taiwan’s president-elect Lai Ching-te could face a tough four years in office with no parliamentary majority, an opposition which wanted to re-start a vexed service trade deal with China and the ever present threat of military action from Beijing. Lai, from the ruling Democratic Progressive Party (DPP), won on Saturday by a comfortable margin though with less than half the vote but his party lost control of parliament on which Lai will have to rely to pass legislation and spending. Lai takes office on May 20. China wasted little time …