feat(landing): Add landing Nuxt page

landing/app/composables/useNewsletterSignup.ts

@@ -0,0 +1,43 @@
+export function useNewsletterSignup() {
+  const isLoading = ref(false)
+  const isSuccess = ref(false)
+  const error = ref<string | null>(null)
+
+  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 }
+      // })
+
+      isSuccess.value = true
+    } catch (e: unknown) {
+      error.value = e instanceof Error ? e.message : 'Ein Fehler ist aufgetreten. Bitte versuchen Sie es später erneut.'
+      throw e
+    } finally {
+      isLoading.value = false
+    }
+  }
+
+  const reset = () => {
+    isLoading.value = false
+    isSuccess.value = false
+    error.value = null
+  }
+
+  return {
+    isLoading,
+    isSuccess,
+    error,
+    submitEmail,
+    reset
+  }
+}