feat(db): StoryDeckEntry presentation table + StoryDeckKind enum

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.Database/Enums/StoryDeckKind.cs

@@ -0,0 +1,11 @@
+namespace SVSim.Database.Enums;
+
+/// <summary>
+/// Which story deck-select group a prebuilt deck belongs to. Build = the named story decks
+/// (build_deck_list); Trial = archetype trial decks (trial_deck_list). Stored as int.
+/// </summary>
+public enum StoryDeckKind
+{
+    Build = 0,
+    Trial = 1,
+}