README: refresh the screenshots after the 2026-10-13 changes (in daylight)

Refresh the README screenshots (EN/RU/ZH) after today's changes: menu colours (on = orange fill, focus = blue frame, #143), U cell hint (#140), MJPEG cells (#139), · damaged corner note (#133), debug page Info switch (#141), HTTP MJPEG slot (#121).

Take them in daylight — the lab cameras show night pictures (IR, dark) in the evening. Planned for 2026-10-14, daytime. Layout: the 8-slot 3×3 layout in LABORATORY.md.