feat: implement bulk user group/tenant move functionality

adminfront/src/features/users/UserListPage.tsx

@@ -53,6 +53,7 @@ import {
 } from "../../lib/adminApi";
 import { t } from "../../lib/i18n";
 import { UserBulkUploadModal } from "./components/UserBulkUploadModal";
+import { UserBulkMoveGroupModal } from "./components/UserBulkMoveGroupModal";
 
 type UserSchemaField = {
   key: string;
@@ -552,6 +553,13 @@ function UserListPage() {
                 >
                   {t("ui.common.status.inactive", "비활성화")}
                 </Button>
+                <UserBulkMoveGroupModal 
+                  userIds={selectedUserIds} 
+                  onSuccess={() => {
+                    query.refetch();
+                    setSelectedUserIds([]);
+                  }} 
+                />
                 <div className="w-px h-4 bg-background/20 mx-1" />
                 <Button 
                   variant="ghost"