fix: refresh mini app login state

src/GmRelay.Web/Program.cs

@@ -117,6 +117,9 @@ app.MapPost("/auth/telegram-webapp", async (
     return Results.Ok(new { redirectUrl = "/" });
 }).DisableAntiforgery();
 
+app.MapGet("/auth/status", (HttpContext context) =>
+    Results.Ok(new { authenticated = context.User.Identity?.IsAuthenticated == true }));
+
 app.MapPost("/auth/logout", async (HttpContext context) =>
 {
     await context.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);