Fix missing ID generation for new news items and add IDs to existing entries

pages/mitgliederbereich/news.vue

@@ -230,12 +230,21 @@ const saveNews = async () => {
 }
 
 const confirmDelete = async (item) => {
+  console.log('Delete item:', item)
+  console.log('Delete item.id:', item.id)
+  
   if (!confirm(`Möchten Sie die News "${item.title}" wirklich löschen?`)) {
     return
   }
 
+  if (!item.id) {
+    alert('Fehler: News-ID fehlt!')
+    return
+  }
+
   try {
-    await $fetch(`/api/news?id=${item.id}`, {
+    console.log('Deleting with ID:', item.id)
+    await $fetch(`/api/news?id=${encodeURIComponent(item.id)}`, {
       method: 'DELETE'
     })