HONG KONG — Raising the stakes in their standoff with the authorities, Hong Kong’s pro-democracy protesters threatened to occupy key government buildings unless the territory’s top official resigns by the end of the day Thursday. An editorial solemnly read Wednesday on state TV said all Hong Kong residents should support authorities in their efforts to “deploy police enforcement decisively” and “restore the social order in Hong Kong as soon as possible.” [...] the Communist Party-run People’s Daily warned of “unimaginable consequences” if the protests persist.