feat(openai): 拆分平台接入和第三方接入的相关接口

src/SKIT.FlurlHttpClient.Wechat.OpenAI/WechatOpenAIEvent.cs

@@ -1,38 +0,0 @@
-using System;
-using System.Xml.Serialization;
-
-namespace SKIT.FlurlHttpClient.Wechat.OpenAI
-{
-    /// <summary>
-    /// 表示微信智能对话 API 回调通知事件的基类。
-    /// </summary>
-    [Serializable]
-    public class WechatOpenAIEvent
-    {
-        public static class Serialization
-        {
-            [XmlRoot("xml")]
-            public interface IXmlSerializable
-            {
-            }
-        }
-
-        /// <summary>
-        /// 获取或设置 AppId。
-        /// </summary>
-        [XmlElement("appid", IsNullable = true)]
-        public string? AppId { get; set; }
-
-        /// <summary>
-        /// 获取或设置事件类型。
-        /// </summary>
-        [XmlElement("event", IsNullable = true)]
-        public string? Event { get; set; }
-
-        /// <summary>
-        /// 获取或设置消息创建时间戳。
-        /// </summary>
-        [XmlElement("createtime", IsNullable = true)]
-        public long? CreateTimestamp { get; set; }
-    }
-}