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/dbtest/reset.go

@@ -109,6 +109,9 @@ var dataTables = []string{
 	"mb_release_groups",             // M502 #5519
 	"mb_artists",                    // M502 #5519
 	"requests",                      // M502 #5520 (was lidarr_requests)
+	"release_blocks",                // M502 #5521
+	"grabs",                         // M502 #5521
+	"want_candidates",               // M502 #5521
 	"wants",                         // M502 #5520
 	"follow_seen_groups",            // M502 #5520
 	"follows",                       // M502 #5520
@@ -180,6 +183,14 @@ func ResetDB(t *testing.T, pool *pgxpool.Pool) {
 	); err != nil {
 		t.Fatalf("dbtest.ResetDB reset release-type profiles: %v", err)
 	}
+	// Search and grab settings (M502 #5521), a singleton reset the same way.
+	if _, err := pool.Exec(ctx, `
+		UPDATE acquisition_settings
+		   SET auto_grab = DEFAULT, search_interval_hours = DEFAULT, allowed_qualities = DEFAULT,
+		       last_pass_at = NULL, last_pass = DEFAULT, updated_at = DEFAULT`,
+	); err != nil {
+		t.Fatalf("dbtest.ResetDB reset acquisition settings: %v", err)
+	}
 	// Notification email settings (M489 #5346), reset the same way.
 	if _, err := pool.Exec(ctx, `
 		UPDATE notification_email_settings