feat: search and grab — music release names, a quality ladder, a paced search schedule and one live grab per want (M502 #5521)

- internal/release: reads a release name (format, bitrate, bit depth and
  sample rate, source, year, video, discography) and judges it against the
  album wanted: the artist and title must be in it; video rips,
  discographies, other versions (drumless, instrumental, karaoke, remix,
  live unless the album is live…) and singles or EPs for an album are
  refused. Quality tiers on Lidarr's ladder; a .torrent's file list is read
  for format, video files and a track count short of the album.
- internal/acquire: fan-out across every search source with a narrowed
  search kept, a process-wide pacer per source, every candidate judged and
  kept with its reasons, and the grab: one live grab per want, tie-broken
  (a person's grab beats the schedule's; a better release replaces a worse
  one unless it is nearly done). Each download lands in its own folder
  under the client's downloads folder.
- internal/wanted: the search schedule, every ten minutes, never-searched
  first, then requests, missing files and followed artists, taking the
  best release when auto-grab is on (the default).
- Migration 0082: acquisition_settings (auto-grab, interval, allowed
  qualities seeded from Lidarr's "Any"), want search columns,
  want_candidates, grabs, release_blocks.
- Web: the Wanted page shows each want's last search, a Search button and
  every release found with its verdict (Grab, Grab anyway, Never this one,
  Allow again). Integrations gains "Searching and grabbing".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/queries/wanted.sql

@@ -186,10 +186,14 @@ SELECT w.id, w.release_group_mbid, w.artist_mbid, w.artist_name, w.title, w.reas
        COALESCE(g.secondary_types, '{}')::text[]                                  AS secondary_types,
        COALESCE(NULLIF(w.first_release_date, ''), g.first_release_date, '')::text AS first_release_date,
        u.username AS requested_by,
-       (SELECT ar.id FROM artists ar WHERE ar.mbid = w.artist_mbid) AS library_artist_id
+       (SELECT ar.id FROM artists ar WHERE ar.mbid = w.artist_mbid) AS library_artist_id,
+       -- The search schedule's last look (#5521), and the download running.
+       w.searched_at, w.search_outcome, w.search_considered, w.best_release, w.best_verdict, w.search_error,
+       gr.name AS grab_name, gr.grabbed_at, gr.origin AS grab_origin, gr.quality AS grab_quality
   FROM wants w
   LEFT JOIN users u ON u.id = w.created_by
   LEFT JOIN mb_release_groups g ON g.mbid = w.release_group_mbid
+  LEFT JOIN grabs gr ON gr.want_id = w.id AND gr.ended_at IS NULL
  WHERE CASE sqlc.arg(state)::text
          WHEN 'held'    THEN w.fulfilled_at IS NOT NULL
          WHEN 'missing' THEN w.fulfilled_at IS NULL AND w.reason = 'missing'