feat(api): search with Meilisearch (M2)

- artists, albums and tracks indexes are rebuilt from PostgreSQL next
  to the live ones and swapped in, so search keeps working; a rebuild
  runs on start, after every scan and when a source is removed
- transliteration fields (Кино ↔ kino) and a retry in the other
  keyboard layout (ghbdtn → привет) reported as corrected_query
- /search/suggest (3 artists, 3 albums, 5 tracks), /search by type
  with cursor pages, /admin/search/reindex; Meilisearch is part of
  /readyz
- found ids are hydrated from the catalog, so a lagging index never
  returns deleted entries

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

services/api/internal/library/service.go

@@ -53,6 +53,9 @@ type Service struct {
 	cfg     Config
 	log     *slog.Logger
 	mu      sync.Mutex // сериализует переподключение одного и того же источника
+
+	// OnCatalogChanged — каталог изменился не сканом (удалено хранилище): переиндексация поиска.
+	OnCatalogChanged func()
 }
 
 // NewService создаёт сервис.
@@ -337,7 +340,13 @@ func (s *Service) DeleteSource(ctx context.Context, id uuid.UUID) error {
 	if err := s.store.DeleteSource(ctx, id); err != nil {
 		return notFound(err)
 	}
-	return s.store.CleanupOrphans(ctx)
+	if err := s.store.CleanupOrphans(ctx); err != nil {
+		return err
+	}
+	if s.OnCatalogChanged != nil {
+		s.OnCatalogChanged()
+	}
+	return nil
 }
 
 // TestResult — итог проверки подключения.