v1.5.0 — deletions resolve by provider id, not by title

The stuck "Falling" deletion was not Ferret being confused about a movie Radarr
lacks — Radarr had it. Jellyfin had "Fallen (2006)" (tmdb 50126) catalogued under
the title "Falling", so the Radarr lookup found nothing. And Radarr holds two
films called "Fallen", so even the correct title would have been ambiguous.

The resolver now tries tmdb, then imdb, then tvdb before falling back to
title+year. Those ids were already collected for cross-server identity matching
in v1.1.0; they just never reached the deletion path.