Initial Nuxt frontend import

- Complete GGZ Ecademy Nuxt.js user portal
- Learning products browser and management
- Member management interface
- User authentication and roles
- Multi-language support (NL/EN)
- Vuex store for state management
- Component-based architecture

plugins/notifier.js

@@ -0,0 +1,7 @@
+export default ({ app, store }, inject) => {
+    inject('notifier', {
+        showMessage({ content = '', color = '', icon = '', errors = [] }) {
+            store.commit('snackbar/showMessage', { content, color, icon, errors })
+        }
+    })
+}