submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.OneBot/Utility/OneBotExt.cs

@@ -0,0 +1,16 @@
+using static Lagrange.Core.Common.Entity.BotUserInfo;
+
+namespace Lagrange.OneBot.Utility;
+
+public static class GenderExt
+{
+    public static string ToOneBotString(this GenderInfo info)
+    {
+        return info switch
+        {
+            GenderInfo.Male => "male",
+            GenderInfo.Female => "female",
+            GenderInfo.Unset or _ => "unknown"
+        };
+    }
+}