submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.OneBot/Core/Entity/OnebotAiCharacts.cs

@@ -0,0 +1,23 @@
+using System.Text.Json.Serialization;
+using Lagrange.Core.Common.Entity;
+
+namespace Lagrange.OneBot.Core.Entity;
+
+[Serializable]
+public class OneBotAiCharacter(AiCharacter aiCharacter)
+{
+    [JsonPropertyName("character_id")] public string CharacterId { get; set; } = aiCharacter.VoiceId;
+
+    [JsonPropertyName("character_name")] public string CharacterName { get; set; } = aiCharacter.CharacterName;
+
+    [JsonPropertyName("preview_url")] public string PreviewUrl { get; set; } = aiCharacter.CharacterVoiceUrl;
+}
+
+public class OneBotAiCharacters(AiCharacterList aiCharacters)
+{
+    [JsonPropertyName("type")] public string Type { get; set; } = aiCharacters.Type;
+
+    [JsonPropertyName("characters")]
+    public List<OneBotAiCharacter> Characters { get; set; } =
+        aiCharacters.Characters.Select(x => new OneBotAiCharacter(x)).ToList();
+}