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; }
+}