feat(tkfb): navigation.js 모듈 추가 — api-config.js import 404 해결

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

system1-factory/web/js/navigation.js

@@ -0,0 +1,14 @@
+// js/navigation.js — ES6 모듈
+// tkfb-core.js (non-module)에서 window에 등록한 함수들에 위임
+
+export function redirectToLogin() {
+  if (window.getLoginUrl) {
+    window.location.href = window.getLoginUrl();
+  } else {
+    window.location.href = '/login.html';
+  }
+}
+
+export function redirectToDefaultDashboard(redirectUrl) {
+  window.location.href = redirectUrl || '/';
+}