Pack opening

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Pack/PackOpenResponse.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Pack;
+
+[MessagePackObject]
+public class PackOpenResponse
+{
+    [JsonPropertyName("pack_list")]
+    [Key("pack_list")]
+    public List<CardPackEntryDto> PackList { get; set; } = new();
+
+    [JsonPropertyName("reward_list")]
+    [Key("reward_list")]
+    public List<RewardListEntry> RewardList { get; set; } = new();
+
+    [JsonPropertyName("rewards")]
+    [Key("rewards")]
+    public List<object> Rewards { get; set; } = new();
+
+    [JsonPropertyName("is_special_effect")]
+    [Key("is_special_effect")]
+    public bool IsSpecialEffect { get; set; }
+
+    /// <summary>Empty array literal — matches prod when no missions completed.</summary>
+    [JsonPropertyName("mission_result")]
+    [Key("mission_result")]
+    public List<object> MissionResult { get; set; } = new();
+}
+
+[MessagePackObject]
+public class CardPackEntryDto
+{
+    [JsonPropertyName("card_id")]
+    [Key("card_id")]
+    public long CardId { get; set; }
+
+    [JsonPropertyName("rarity")]
+    [Key("rarity")]
+    public int Rarity { get; set; }
+
+    /// <summary>Always 1 per drawn slot — matches prod sample shape.</summary>
+    [JsonPropertyName("number")]
+    [Key("number")]
+    public int Number { get; set; } = 1;
+}