feat: 优化支付宝回调通知记录功能

- 新增SignStr字段记录支付宝回调的原始签名字符串
- 修改日志记录格式，使用键值对形式记录回调通知数据
- 更新PayManager.RecordPayNoticeAsync方法支持记录原始签名字符串
- 移除AlipayManager中冗余的注释说明

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/Pay/PayNoticeRecordAggregateRoot.cs

@@ -55,4 +55,10 @@ public class PayNoticeRecordAggregateRoot: FullAuditedAggregateRoot<Guid>
     /// </summary>
     [SugarColumn(ColumnDataType = StaticConfig.CodeFirst_BigString)]
     public string NotifyData { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 原始signstr
+    /// </summary>
+    [SugarColumn(ColumnDataType = StaticConfig.CodeFirst_BigString)]
+    public string SignStr { get; set; }
 }