Deck list work

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/MyPageRefreshResponse.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses;
+
+/// <summary>
+/// /mypage/refresh response — a slim notification-delta payload, NOT a full state refresh.
+/// Prod sends exactly 3 top-level keys, all of which the client reads unconditionally:
+///
+/// <list type="bullet">
+///   <item><c>friend_battle_invite_count</c> — int, viewer's room-invite count
+///         (consumed at <c>MyPageRefreshTask.cs:29</c>).</item>
+///   <item><c>shop_notification</c> — same nested shape as /mypage/index's shop_notification.
+///         The side-effect call <c>ShopNotification.SetShopNotification</c> unconditionally indexes
+///         all four sub-keys (card_pack / build_deck / sleeve / leader_skin), already handled by
+///         our <see cref="ShopNotification"/> DTO's field initializers.</item>
+///   <item><c>gathering_notification</c> — new shape distinct from /mypage/index's gathering_info.
+///         Carries only the matching-established message string.</item>
+/// </list>
+///
+/// All three fields are required-present per the new "anything prod emits, we emit" methodology
+/// — even though the third call site looks tolerant, omitting the key would throw
+/// KeyNotFoundException at LitJson's indexer.
+/// </summary>
+[MessagePackObject]
+public class MyPageRefreshResponse
+{
+    [JsonPropertyName("friend_battle_invite_count")]
+    [Key("friend_battle_invite_count")]
+    public int FriendBattleInviteCount { get; set; }
+
+    [JsonPropertyName("shop_notification")]
+    [Key("shop_notification")]
+    public ShopNotification ShopNotification { get; set; } = new();
+
+    [JsonPropertyName("gathering_notification")]
+    [Key("gathering_notification")]
+    public GatheringNotification GatheringNotification { get; set; } = new();
+}