Change output field name.

src/Infrastructure/BotSharp.Abstraction/Instructs/Models/InstructResult.cs

@@ -2,6 +2,7 @@ namespace BotSharp.Abstraction.Instructs.Models;
 
 public class InstructResult : ITrackableMessage
 {
+    [JsonPropertyName("message_id")]
     public string MessageId { get; set; }
     public string Text { get; set; }
     public object Data { get; set; }

src/Infrastructure/BotSharp.OpenAPI/ViewModels/Conversations/MessageResponseModel.cs

@@ -18,5 +18,6 @@ public class MessageResponseModel : InstructResult
     /// Rich message for UI rendering
     /// </summary>
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    [JsonPropertyName("rich_content")]
     public object? RichContent { get; set; }
 }