fix(config): update Auth0 domain and clientId defaults

Set default values for Auth0 domain and clientId in nuxt.config.ts to  
ensure the application works with predefined settings when environment  
variables are not provided.

nuxt.config.ts

@@ -63,8 +63,8 @@ export default defineNuxtConfig({
     public: {
       apiBase: process.env.NUXT_PUBLIC_API_BASE || 'http://localhost:8080',
       auth0: {
-        domain: process.env.NUXT_PUBLIC_AUTH0_DOMAIN || '',
-        clientId: process.env.NUXT_PUBLIC_AUTH0_CLIENT_ID || '',
+        domain: process.env.NUXT_PUBLIC_AUTH0_DOMAIN || 'unbound.eu.auth0.com',
+        clientId: process.env.NUXT_PUBLIC_AUTH0_CLIENT_ID || '7k3rZ4HRxRTkTCI3ytpF8ji0o531Zq3M',
         audience: process.env.NUXT_PUBLIC_AUTH0_AUDIENCE || 'https://schemas.unbound.se',
       },
     },