fix(cache): tkds→tkfb 변경 후 전 서비스 캐시 버스팅 갱신

tkfb-core.js v=2026040104, tksupport/tksafety/tkpurchase/tkuser-core.js,
system2 api-base.js, system3 app.js 캐시 버스팅 일괄 갱신.
브라우저 캐시에 남은 구버전(tkds 리다이렉트) 강제 갱신.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tkpurchase/web/accounts.html

@@ -133,7 +133,7 @@
         </div>
     </div>
 
-    <script src="/static/js/tkpurchase-core.js?v=2026031604"></script>
+    <script src="/static/js/tkpurchase-core.js?v=2026040101"></script>
     <script src="/static/js/tkpurchase-accounts.js?v=2026031601"></script>
     <script>initAccountsPage();</script>
 </body>