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/constants.js

@@ -0,0 +1,11 @@
+export const ALL_CONSTANT = {
+  store: {
+    members: {
+      fieldsAllowedNull: ['end_membership'],
+    },
+  },
+};
+
+export default ({}, inject) => {
+  inject('constants', ALL_CONSTANT);
+};