新增私聊相关

Hotfix/Social/Mail/Helper/MailHelper.cs

@@ -0,0 +1,32 @@
+using Fantasy;
+using Fantasy.Async;
+
+namespace NB.Chat;
+
+/// <summary>
+/// 发送邮件接口
+/// </summary>
+public static class MailHelper
+{
+    
+    public static async FTask Send(Scene scene, MailBox mailBox)
+    {
+        if (mailBox.BoxType == MailBoxType.None)
+        {
+            Log.Error("不支持的邮件类型");
+            return;
+        }
+
+        switch (mailBox.BoxType)
+        {
+            case MailBoxType.All:
+            {
+                break;
+            }
+            case MailBoxType.Specify:
+            {
+                break;
+            }
+        }
+    }
+}