Add API_BASE_URL import to multiple Vue components for consistent API endpoint usage

frontend/src/views/Holidays.vue

@@ -192,7 +192,9 @@ import { ref, onMounted } from 'vue'
 import { useAuthStore } from '../stores/authStore'
 import { useModal } from '../composables/useModal'
 import Modal from '../components/Modal.vue'
+import { API_BASE_URL } from '@/config/api'
 
+const API_URL = API_BASE_URL
 const authStore = useAuthStore()
 const futureHolidays = ref([])
 const pastHolidays = ref([])