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

types/plugins/constants/index.d.ts

@@ -0,0 +1,19 @@
+import Vue from 'vue';
+import { Store } from 'vuex';
+import { ALL_CONSTANT } from '~/plugins/constants';
+
+type ConstantMap<T = typeof ALL_CONSTANT> = {
+  [K in keyof T]: T[K];
+};
+
+declare module 'vue/types/vue' {
+  interface Vue {
+    readonly $constants: ConstantMap;
+  }
+}
+
+declare module 'vuex/types' {
+  interface Store {
+    readonly $constants: ConstantMap;
+  }
+}