Thailand’s military rulers detained hundreds of people without charges, tortured some prisoners and systematically stifled dissent since seizing power in a May coup, a leading human rights watchdog reported Thursday. Amnesty International said that although most prisoners were released within a week, they remain at risk of prosecution in military courts. Thai military junta Narong Sangnak / European Pressphoto Agency A Thai soldier stands guard in front of Government House during the first cabinet meeting of the military junta chief and newly-appointed Prime Minister Gen. Prayuth Chan-ocha in…