By Laila Bassam and Maya Gebeily BEIRUT (Reuters) – Iran-backed Hezbollah has rebuffed Washington’s initial ideas for cooling tit-for-tat fighting with neighbouring Israel, such as pulling its fighters further from the border, but remains open to U.S. diplomacy to avoid a ruinous war, Lebanese officials said. U.S. envoy Amos Hochstein has been leading a diplomatic outreach to restore security at the Israel-Lebanon frontier as the wider region teeters dangerously towards a major escalation of the conflict ignited by the Gaza war. Attacks by Yemen’s Iran-aligned Houthis on shipping in the Red Se…