Add interactive zone point-light debug markers to PRK.Client

Add developer-only selectable world-position markers for authored indoor/outdoor point lights, including embedded statel lights collected in the zone snapshot. Reuse Developer window and retained GUI. Live session-only controls for light strength, colour, range and attenuation; selected light metadata and reset selected/all. Preserve source light scopes, room data, indirect lighting and occluders; discard edits/selection on zone replacement. Markers are explicitly x-ray debug overlays, disabled by default, not game assets. No persistence/export or carried-light editing in this scope. Validate override isolation, reset, zone changes, projection and relevant build/tests; live gameplay check remains explicit if unavailable.