Rows whose stored ForwardingSpec is enabled get a volcano chip after
the protocol tags: '转发 → <target remark>' for managed landings
(resolved against the full row set), '转发 → <address>:<port>' for
manual endpoints, '转发 → SK5' when the target row is gone. Text is
ellipsised at 180px with a tooltip so narrow rows never overflow.
Data rides the slim list's existing forwarding field — no API change.