feat(replay): add /replay/info and /replay/detail DTOs

All numeric fields on ReplayInfoItemDto ship as string — matches prod
capture (frame 96 of traffic_prod_misc_clicking.ndjson). api-spec doc
will be updated separately.

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

SVSim.EmulatedEntrypoint/Models/Dtos/Replay/ReplayDetailRequestDto.cs

@@ -0,0 +1,17 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Replay;
+
+/// <summary>
+/// /replay/detail request. ReplayDetailTaskParam declares <c>new int viewer_id</c>
+/// shadowing the inherited field — wire ships both. We accept both; the body's
+/// <c>viewer_id</c> identifies the replay owner (typically same as caller).
+/// </summary>
+[MessagePackObject]
+public sealed class ReplayDetailRequestDto : BaseRequest
+{
+    [JsonPropertyName("battle_id"), Key("battle_id")]
+    public long BattleId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Replay/ReplayInfoItemDto.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Replay;
+
+/// <summary>
+/// One entry in /replay/info's replay_list. Every numeric field ships as STRING
+/// on the wire — matches prod capture verbatim (see data_dumps/captures/
+/// traffic_prod_misc_clicking.ndjson, frame 96). The api-spec doc shows some
+/// fields as number; capture overrides.
+/// </summary>
+[MessagePackObject]
+public sealed class ReplayInfoItemDto
+{
+    [JsonPropertyName("battle_type"), Key("battle_type")]
+    public string BattleType { get; set; } = "0";
+
+    [JsonPropertyName("two_pick_type"), Key("two_pick_type")]
+    public string TwoPickType { get; set; } = "0";
+
+    [JsonPropertyName("deck_format"), Key("deck_format")]
+    public string DeckFormat { get; set; } = "0";
+
+    [JsonPropertyName("battle_id"), Key("battle_id")]
+    public string BattleId { get; set; } = "0";
+
+    [JsonPropertyName("is_limit_turn"), Key("is_limit_turn")]
+    public string IsLimitTurn { get; set; } = "0";
+
+    [JsonPropertyName("opponent_name"), Key("opponent_name")]
+    public string OpponentName { get; set; } = "";
+
+    [JsonPropertyName("class_id"), Key("class_id")]
+    public string ClassId { get; set; } = "0";
+
+    [JsonPropertyName("opponent_class_id"), Key("opponent_class_id")]
+    public string OpponentClassId { get; set; } = "0";
+
+    [JsonPropertyName("sub_class_id"), Key("sub_class_id")]
+    public string SubClassId { get; set; } = "0";
+
+    [JsonPropertyName("opponent_sub_class_id"), Key("opponent_sub_class_id")]
+    public string OpponentSubClassId { get; set; } = "0";
+
+    [JsonPropertyName("rotation_id"), Key("rotation_id")]
+    public string RotationId { get; set; } = "0";
+
+    [JsonPropertyName("opponent_rotation_id"), Key("opponent_rotation_id")]
+    public string OpponentRotationId { get; set; } = "0";
+
+    [JsonPropertyName("opponent_country_code"), Key("opponent_country_code")]
+    public string OpponentCountryCode { get; set; } = "";
+
+    [JsonPropertyName("chara_id"), Key("chara_id")]
+    public string CharaId { get; set; } = "0";
+
+    [JsonPropertyName("opponent_chara_id"), Key("opponent_chara_id")]
+    public string OpponentCharaId { get; set; } = "0";
+
+    [JsonPropertyName("opponent_emblem_id"), Key("opponent_emblem_id")]
+    public string OpponentEmblemId { get; set; } = "0";
+
+    [JsonPropertyName("opponent_degree_id"), Key("opponent_degree_id")]
+    public string OpponentDegreeId { get; set; } = "0";
+
+    [JsonPropertyName("is_win"), Key("is_win")]
+    public string IsWin { get; set; } = "0";
+
+    [JsonPropertyName("battle_start_time"), Key("battle_start_time")]
+    public string BattleStartTime { get; set; } = "";
+
+    [JsonPropertyName("create_time"), Key("create_time")]
+    public string CreateTime { get; set; } = "";
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Replay/ReplayInfoResponseDto.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Replay;
+
+[MessagePackObject]
+public sealed class ReplayInfoResponseDto
+{
+    /// <summary>
+    /// Required — client does not guard with Keys.Contains. Emit empty list, never null.
+    /// </summary>
+    [JsonPropertyName("replay_list"), Key("replay_list")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
+    public List<ReplayInfoItemDto> ReplayList { get; set; } = new();
+
+    // feature_maintenance_list intentionally omitted — optional per spec, never set
+    // because we don't gate replay viewing. WhenWritingNull drops it from the wire.
+}