Adds a separate HTTP server (not the upstream API on :25590) for the
operator dashboard. Single-page UI with two panes:
* routes table — current pg-synced mappings, polled every 2s
* logs — SSE stream backed by a logrus hook + 500-entry ring buffer
Opt-in via AUTOMC_UI_BINDING (e.g. ":8082"); unset = no-op, behaves
exactly like upstream. Designed to live behind server-manager's
/infra/mc-router/* reverse-proxy.
Patch is internal/automc-only, same fork philosophy as the rest —
upstream files stay verbatim.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
