feat(frontend): Use betterAuth implementation from nuxthub-better-auth project

legalconsenthub/pages/login.vue

@@ -30,6 +30,7 @@ definePageMeta({ layout: 'auth' })
 useSeoMeta({ title: 'Login' })
 
 const toast = useToast()
+const { signIn } = useAuth()
 
 const fields = [
   {
@@ -81,7 +82,7 @@ function onSubmit(payload: FormSubmitEvent<Schema>) {
     alert('Bitte alle Felder ausfüllen')
     return
   }
-  authClient.signIn.email(
+  signIn.email(
     {
       email: payload.data.email,
       password: payload.data.password