Adds Monitor/Config tab switcher. Config view splits into stations
panel (inline create/edit/delete + per-station signal binding expand)
and segments panel (inline create/edit/delete + expandable detail with
step add/delete, interlock add/delete, and resource-keys replace).
UI talks to the existing ops CRUD endpoints exclusively; no engine
changes. node --check passes for all eight ops JS modules; backend
tests still green. Browser verification still required end-to-end.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
