PAJU, South Korea — North Korea on Thursday ordered a military takeover of a factory park that was the last major symbol of cooperation with South Korea, saying Seoul’s suspension of operations at the jointly run facility was a “dangerous declaration of war.” Pyongyang said it was immediately deporting the hundreds of South Koreans who work at the complex just across the world’s most heavily armed border in the city of Kaesong, pulling out the tens of thousands of North Korean employees and freezing all South Korean assets.