Deck list work

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/MyPageRefreshRequest.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+/// <summary>
+/// Request body for /mypage/refresh. Carries only the standard auth envelope —
+/// no <c>carrier</c> field, unlike MyPageIndexRequest. Confirmed against prod traffic
+/// in data_dumps/traffic_prod.ndjson: both refresh request bodies have exactly
+/// <c>viewer_id / steam_id / steam_session_ticket</c>.
+/// </summary>
+[MessagePackObject]
+public class MyPageRefreshRequest : BaseRequest
+{
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/PaymentItemListRequest.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+/// <summary>
+/// Request body for /payment_pc/item_list. Prod sends only the standard auth envelope
+/// (viewer_id / steam_id / steam_session_ticket) — no additional fields.
+/// </summary>
+[MessagePackObject]
+public class PaymentItemListRequest : BaseRequest
+{
+}