feat(replay): add ReplayHistoryReader for newest-first list query

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

SVSim.Database/Services/Replay/IReplayHistoryReader.cs

@@ -0,0 +1,7 @@
+namespace SVSim.Database.Services.Replay;
+
+public interface IReplayHistoryReader
+{
+    /// <summary>Newest-first by CreateTime. Caps at <paramref name="take"/> (default 50).</summary>
+    Task<IReadOnlyList<ReplayHistoryEntry>> GetRecentAsync(long viewerId, int take, CancellationToken ct);
+}