Merge upstream/main: bikeshare Toronto and scoped city failures

Upstream's #641 (bikeshare Toronto, city failures scoped to range with
partial outages read DEGRADED/STALE) replaced the layer-level GBFS
error strings this branch had msg()-marked, in the two paths that
conflicted.

- ingestion.js/viewport.js taken as upstream's per-city
  _failedCityIds tracking; the layer-level error assignments are gone.
- 'GBFS fetch error' still reaches the panel via stats.error from
  controls.js, so its mark moved there (translateFeedError keeps
  translating it).
- 'GBFS status update failed' no longer exists anywhere: pruned from
  es/ru and from the layerStatusText SITES table, which now pins the
  controls.js site instead of the removed ones.

Also brings #581 (upstream-read caps, OpenSky 429 cooldown) - no i18n
surface.

npm run i18n: complete (2553), no unmarked strings. npm test: only the
pre-existing environmental OPENAI_API_KEY leak in devFreshDotenv fails.
Build passes.

src/i18n/locales/ru.json

@@ -2246,7 +2246,6 @@
   "loading coverage...": "загрузка покрытия...",
   "live feed unavailable": "поток в реальном времени недоступен",
   "GBFS fetch error": "ошибка загрузки GBFS",
-  "GBFS status update failed": "не удалось обновить статус GBFS",
   "Open the Street Level panel to view imagery": "Откройте панель «Уличные снимки», чтобы их посмотреть",
   "Image could not be opened": "Не удалось открыть снимок",
   "Mapillary rejected MAPILLARY_CLIENT_TOKEN — replace it in Provider Settings": "Mapillary отклонил MAPILLARY_CLIENT_TOKEN — замените его в «Настройках провайдеров»",