Improve title resolution - #44
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retain_titles pruned the Sonarr/Radarr title caches down to the IDs seen in a single RSS-sync page, wiping entries cached by other pages and by tv/movie searches. That caused repeated lookups against Sonarr/Radarr and a cache-file rewrite on every generic search. The caches only hold small title strings, so they are now left to grow with the set of titles actually searched.
The generic search resolved feed titles one torrent at a time, so a cold cache meant up to a page of serial Sonarr/Radarr round trips. Torrents are now mapped to unique (tvdb, season)/tmdb lookup keys first, resolved concurrently (capped at 8 in-flight lookups), then grouped. Per-request title memoization falls out of the dedup, so the ad-hoc HashMap caches are gone.
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retain_titleswas overwriting the title cache on every call.the title cache will now grow and hold older titles.