feat(http): stub /arena_colosseum/get_fee_info (is_colosseum_period:false)

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/ArenaColosseum/GetFeeInfoRequest.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.ArenaColosseum;
+
+[MessagePackObject]
+public class GetFeeInfoRequest { }

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/ArenaColosseum/GetFeeInfoResponseDto.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.ArenaColosseum;
+
+/// <summary>
+/// Minimum-viable stub for /arena_colosseum/get_fee_info — emits is_colosseum_period:false
+/// so the client (Wizard/ColosseumEntryInfoTask.cs:99) skips the rest of the parse and the
+/// home/arena screen renders without 404ing. TODO: implement the full Colosseum entry flow
+/// when the Colosseum format is brought online.
+/// </summary>
+[MessagePackObject]
+public class GetFeeInfoResponseDto
+{
+    /// <summary>
+    /// Per-viewer Colosseum entry status (rest_entry_num, now_round_id, is_last_day, etc.).
+    /// Empty object — client (ColosseumEntryInfoTask.cs:146) guards with `if (status.Count != 0)`,
+    /// so an empty dict short-circuits cleanly.
+    /// </summary>
+    [JsonPropertyName("colosseum_status")] [Key("colosseum_status")]
+    public ColosseumStatusDto ColosseumStatus { get; set; } = new();
+
+    [JsonPropertyName("colosseum_info")] [Key("colosseum_info")]
+    public ColosseumInfoDto ColosseumInfo { get; set; } = new();
+}
+
+[MessagePackObject]
+public class ColosseumStatusDto { }
+
+[MessagePackObject]
+public class ColosseumInfoDto
+{
+    /// <summary>
+    /// false = no Colosseum event running. Client (ColosseumEntryInfoTask.cs:100) gates every
+    /// other field on this — emitting false is what lets us ship an otherwise-empty info block.
+    /// </summary>
+    [JsonPropertyName("is_colosseum_period")] [Key("is_colosseum_period")]
+    public bool IsColosseumPeriod { get; set; } = false;
+}