Deck list work

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckListResponse.cs

@@ -16,9 +16,29 @@ public class DeckListResponse
     [JsonPropertyName("maintenance_card_list")]
     [Key("maintenance_card_list")] public List<long> MaintenanceCardList { get; set; } = new();
 
+    /// <summary>
+    /// Single-format viewer decks. Emitted when the request specified a specific format
+    /// (e.g. Rotation, Unlimited) — mutually exclusive with the per-format keys below.
+    /// </summary>
     [JsonPropertyName("user_deck_list")]
     [Key("user_deck_list")] public List<UserDeck>? UserDeckList { get; set; }
 
+    /// <summary>
+    /// Per-format viewer decks. Emitted when the request specified All format (deck_format=0).
+    /// Prod's <c>DeckListUtility.ParseDeckInfoResponceData</c> All-format branch only walks these
+    /// per-format keys (not user_deck_list), so the controller swaps shape based on the request.
+    /// The PreRotation / Crossover / Avatar siblings exist in client code but prod omits them
+    /// for fresh viewers; we mirror that omission.
+    /// </summary>
+    [JsonPropertyName("user_deck_rotation")]
+    [Key("user_deck_rotation")] public List<UserDeck>? UserDeckRotation { get; set; }
+
+    [JsonPropertyName("user_deck_unlimited")]
+    [Key("user_deck_unlimited")] public List<UserDeck>? UserDeckUnlimited { get; set; }
+
+    [JsonPropertyName("user_deck_my_rotation")]
+    [Key("user_deck_my_rotation")] public List<UserDeck>? UserDeckMyRotation { get; set; }
+
     /// <summary>
     /// Global starter decks, keyed by deck_no as string (prod ids 91-98 — one per class).
     /// </summary>