Chained Jumpbox Support for Smart CLI Connections

NetBrain currently supports configuring a single jumpbox hop when establishing Smart CLI connections to end devices, with no mechanism to define a sequence of two or more jumpboxes in a chain. This enhancement would allow administrators to configure multiple jumpboxes in a chained sequence, so that a Smart CLI session can traverse each hop in order to reach the target device. Customers operating segmented or layered network environments that require multiple jump hosts to reach end devices would gain full connectivity through Smart CLI without relying on manual, unsupported workarounds.