fix(tk2): rewards array uses ReceivedReward shape (reward_detail_id/item_type/is_usable)

The /retire and /finish responses carry two reward arrays with DIFFERENT
key schemas:

  rewards[]      → ReceivedReward(JsonData) parser
                   {reward_type, reward_detail_id, item_type, reward_count?, is_usable}
  reward_list[]  → PlayerStaticData.UpdateHaveUserGoodsNumByJsonData
                   {reward_type, reward_id, reward_num}

We were emitting both with reward_list's schema, so the client threw
KeyNotFoundException on `data["reward_detail_id"]` while parsing each
delta entry — observed live as the retire-screen failure.

- New TwoPickRewardReceivedDto mirrors the existing Achievement/
  TotalReceiveCountDto shape.
- FinishResponseDto.Rewards switched from List<RewardEntryDto>
  to List<TwoPickRewardReceivedDto>.
- GrantRunRewardsAndDeleteAsync pre-loads ItemEntry.Type for any
  Item-typed reward so item_type ships correctly (0 for currencies).
- Existing tests renamed RewardNum→RewardCount on the deltas list.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/ArenaTwoPick/FinishResponseDto.cs

@@ -7,11 +7,43 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.ArenaTwoPick;
 [MessagePackObject]
 public class FinishResponseDto
 {
-    /// <summary>Per-grant deltas — drives "+N received" popup.</summary>
+    /// <summary>
+    /// Per-grant deltas — drives the "+N received" popup. Parsed by the client via
+    /// <c>ReceivedReward(JsonData)</c> (Shadowverse_Code/ReceivedReward.cs:25) which expects
+    /// the {reward_type, reward_detail_id, item_type, reward_count?, is_usable} shape — distinct
+    /// from the <c>RewardEntryDto</c> shape used by <see cref="RewardList"/>.
+    /// </summary>
     [JsonPropertyName("rewards")] [Key("rewards")]
-    public List<RewardEntryDto> Rewards { get; set; } = new();
+    public List<TwoPickRewardReceivedDto> Rewards { get; set; } = new();
 
     /// <summary>Post-state totals — drives PlayerStaticData.UpdateHaveUserGoodsNumByJsonData.</summary>
     [JsonPropertyName("reward_list")] [Key("reward_list")]
     public List<RewardEntryDto> RewardList { get; set; } = new();
 }
+
+/// <summary>
+/// Wire shape parsed by Shadowverse_Code/ReceivedReward.cs ctor. Used in the
+/// <c>rewards</c> arrays of /arena_two_pick/{retire,finish}.
+/// </summary>
+[MessagePackObject]
+public class TwoPickRewardReceivedDto
+{
+    [JsonPropertyName("reward_type")] [Key("reward_type")]
+    public int RewardType { get; set; }
+
+    [JsonPropertyName("reward_detail_id")] [Key("reward_detail_id")]
+    public long RewardDetailId { get; set; }
+
+    [JsonPropertyName("reward_count")] [Key("reward_count")]
+    public int RewardCount { get; set; }
+
+    /// <summary>
+    /// Item-master <c>item_type</c> enum (1=challenge ticket, 2=card-pack ticket, …) for Item-typed
+    /// rewards. 0 for currencies (Crystal/Rupy/RedEther) — the client only reads this for Items.
+    /// </summary>
+    [JsonPropertyName("item_type")] [Key("item_type")]
+    public int ItemType { get; set; }
+
+    [JsonPropertyName("is_usable")] [Key("is_usable")]
+    public bool IsUsable { get; set; } = true;
+}