chore: remove debug logging from latency test

debug: more logging in handleTestLatency

debug: add logging to SendToNode and test_latency handler

fix: guard gradient fill against non-finite bbox during initial render

feat: latency test callback + traffic chart upgrade

feat: SNI port mux + traffic charts + latency/UX fixes

feat: managed chain + manual latency + chain latency

feat: implement hop_chain runtime with load balancer

fix: bump panel asset version

fix: restore route builder copy

feat: model phase 2 routes as ordered hops

feat: add route builder fields to rules page

feat: add phase 2 node group skeleton

docs: add phase 1 tunnel guide

test: add phase 1 smoke coverage