Episodes ride along with their show instead of being a separate (tens-of-thousands)
queue: when the TMDB worker matches a show, it now backfills every season's
episodes — still / overview / rating — via /tv/<id>/season/<n> (one call per
season, gap-only so server data is never clobbered). Also backfills season
overviews.
The worker manager 'knows about it': the TMDB breakdown gains an Episodes
coverage entry (matched = has art, rest = pending), shown as its own card; the
Episodes view lists episodes still missing art. It's coverage-only, kept out of
the worker's idle/pending calc so it never blocks 'Complete'.
Seam tests: client season parse, worker cascade fills episodes, gap-only backfill
+ season overview, breakdown coverage (tmdb only), missing-art list, idle calc
ignores episode coverage.
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