- add: Auth service

Nebula.Launcher/Models/Auth/LoginToken.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace Nebula.Launcher.Models.Auth;
+
+public readonly struct LoginToken
+{
+    public readonly string Token;
+    public readonly DateTimeOffset ExpireTime;
+
+    public LoginToken(string token, DateTimeOffset expireTime)
+    {
+        Token = token;
+        ExpireTime = expireTime;
+    }
+}