Deck list work

SVSim.Database/Repositories/Deck/IDeckRepository.cs

@@ -6,6 +6,14 @@ namespace SVSim.Database.Repositories.Deck;
 public interface IDeckRepository
 {
     Task<List<ShadowverseDeckEntry>> GetDecks(long viewerId, Format format);
+
+    /// <summary>
+    /// Bulk-fetch viewer decks grouped by format. Returns a dict keyed by every format in
+    /// <paramref name="formats"/> — missing formats map to empty lists so callers don't need
+    /// dict-existence checks. Single viewer-load, no N+1.
+    /// </summary>
+    Task<Dictionary<Format, List<ShadowverseDeckEntry>>> GetDecksByFormats(long viewerId, IEnumerable<Format> formats);
+
     Task<ShadowverseDeckEntry?> GetDeck(long viewerId, Format format, int deckNo);
     Task<int> GetEmptyDeckNumber(long viewerId, Format format);
     Task<ShadowverseDeckEntry> UpsertDeck(long viewerId, Format format, int deckNo, Action<ShadowverseDeckEntry> mutate);