fix: remove redirect loop at root path

src/TaxBaik.Web/Program.cs

@@ -392,9 +392,6 @@ app.MapHealthChecks("/healthz");
 app.MapRazorPages();  // Sitemap.cshtml, Rss.cshtml, Feed.cshtml
 app.MapStaticAssets();
 
-// 루트 경로 기본값
-app.MapGet("/", () => Results.Redirect("/taxbaik/"));
-
 // SPA 라우팅 폴백 (가장 마지막에!)
 app.MapFallbackToFile("admin/{*path:nonfile}", "admin/index.html");
 app.MapFallbackToFile("portal/{*path:nonfile}", "portal/index.html");