Add update-vendor.sh symlink support, unify install.sh vendor flow

- update-vendor.sh now creates webui/vendor symlinks (htm.js)
- install.sh calls update-vendor.sh after package install
- Add vendor/.empty and webui/vendor/.empty as directory placeholders in git

webui/static/hoover/index.js

@@ -43,5 +43,8 @@ export { Badge, StatusDot, Empty, Card, ConfirmDelete, Table, ActionButton, cert
 /* ── UI Components: Modal ────────────────────────────────────── */
 export { openModal, closeModal, closeAllModals, modalVNodes, refreshModals, formModal, MultiSelectModal, QuickModal } from './components/modal.js?v=8';
 
+/* ── UI Components: Apply ────────────────────────────────────── */
+export { ApplyConfirm } from './components/applyconfirm.js?v=8';
+
 /* ── UI Components: Toast ────────────────────────────────────── */
 export { ToastContainer } from './components/toast.js?v=8';