feat: a wanted list — follow artists on release-type profiles; requests and re-acquisition become wants (M502 #5520)

Minstrel keeps its own list of what it is to get, keyed by MusicBrainz
release group. A want comes from an approved request, a new release by a
followed artist, or an album whose files went missing, and is held once the
library has a full edition of it.

- Migration 0081: release_type_profiles (Standard seeded: Album, EP,
  Single, studio only), follows, follow_seen_groups and wants.
  lidarr_requests becomes requests with plain *_mbid columns; approved
  album and track requests move onto the wanted list, approved artist
  requests become follows, and the library's album artists start out
  followed. missing_reacquisitions and the retry settings go.
- internal/wanted: follows are checked against MusicBrainz discographies
  daily. The first check sets a baseline, and only releases after it are
  wanted unless the follow asked for what already exists. Profiles filter
  by primary and secondary type, so live recordings stay out unless a
  profile ticks Live.
- internal/requests (was lidarrrequests): approving puts the request on
  the wanted list, and an artist request can be approved on a chosen
  profile. A request completes when its want is held.
- The re-acquisition sweeper wants a missing album back instead of asking
  Lidarr; searching for it is the search schedule's (#5521).
- Web: an admin Wanted page (Wanted, Missing files, Held, Following), a
  follow control on artist pages, a release-type profiles card on
  Integrations, "Approve on a profile" on Requests, and want state on
  Missing files. The artist detail API returns the artist's MBID.
- Android: the request body sends artist_mbid, album_mbid and track_mbid.

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

internal/dbtest/reset.go

@@ -108,6 +108,10 @@ var dataTables = []string{
 	"mb_artist_release_groups",      // M502 #5519
 	"mb_release_groups",             // M502 #5519
 	"mb_artists",                    // M502 #5519
+	"requests",                      // M502 #5520 (was lidarr_requests)
+	"wants",                         // M502 #5520
+	"follow_seen_groups",            // M502 #5520
+	"follows",                       // M502 #5520
 	"tracks",
 	"albums",
 	"artists",
@@ -165,6 +169,17 @@ func ResetDB(t *testing.T, pool *pgxpool.Pool) {
 	); err != nil {
 		t.Fatalf("dbtest.ResetDB reset loudness settings: %v", err)
 	}
+	// Release-type profiles (M502 #5520): migration 0081 seeds "Standard" as
+	// the default. Tests add and edit profiles, so put back exactly the
+	// seeded row rather than truncating it away.
+	if _, err := pool.Exec(ctx, `
+		DELETE FROM release_type_profiles WHERE name <> 'Standard';
+		UPDATE release_type_profiles
+		   SET primary_types = ARRAY['Album', 'EP', 'Single'], secondary_types = '{}', is_default = true
+		 WHERE name = 'Standard'`,
+	); err != nil {
+		t.Fatalf("dbtest.ResetDB reset release-type profiles: %v", err)
+	}
 	// Notification email settings (M489 #5346), reset the same way.
 	if _, err := pool.Exec(ctx, `
 		UPDATE notification_email_settings