fix: hardcoded / in logout route and not default to user injected config

src/routes/logout.ts

@@ -17,8 +17,7 @@ function inferPostLogoutRedirectUri(
   reqUrl: URL,
 ): string {
   if ("absolute" in options.redirectUri) return options.redirectUri.absolute;
-  // Default to site root
-  const u = new URL("/", reqUrl);
+  const u = new URL(options.routes.callback, reqUrl);
   return u.toString();
 }