feat(landing): Add kontakt, datenschutz pages, integrate brevo newsletter and contact, add error-handler

landing/app/composables/useNewsletterSignup.ts

@@ -4,24 +4,20 @@ export function useNewsletterSignup() {
   const isSuccess = ref(false)
   const error = ref<string | null>(null)
 
-  const submitEmail = async (_email: string) => {
+  const submitEmail = async (email: string) => {
     isLoading.value = true
     error.value = null
 
     try {
-      // Simulate API call - replace with actual newsletter service integration
-      await new Promise((resolve) => setTimeout(resolve, 1500))
-
-      // TODO: Integrate with external newsletter service (e.g., Mailchimp, ConvertKit, etc.)
-      // Example:
-      // await $fetch('/api/newsletter/subscribe', {
-      //   method: 'POST',
-      //   body: { email }
-      // })
+      await $fetch('/api/newsletter/subscribe', {
+        method: 'POST',
+        body: { email }
+      })
 
       isSuccess.value = true
     } catch (e: unknown) {
-      error.value = e instanceof Error ? e.message : t('errors.generic')
+      const fetchError = e as { statusMessage?: string }
+      error.value = fetchError.statusMessage || t('errors.generic')
       throw e
     } finally {
       isLoading.value = false