feat(contacts): Anrede als Dropdown (Herr/Frau/Divers/Dr./Prof.)

editable bleibt aktiv, damit eigene Werte weiterhin moeglich sind.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/ContactsView.vue

@@ -175,9 +175,10 @@
             </div>
 
             <div class="field-row">
-              <div class="field" style="max-width:120px">
+              <div class="field" style="max-width:140px">
                 <label>Anrede</label>
-                <InputText v-model="contactForm.prefix" />
+                <Select v-model="contactForm.prefix" :options="prefixOptions"
+                        editable showClear placeholder="–" />
               </div>
               <div class="field">
                 <label>Vorname</label>
@@ -409,6 +410,7 @@ const urlTypes = [
   { label: 'Privat', value: 'home' }, { label: 'Geschäftlich', value: 'work' },
   { label: 'Sonstige', value: 'other' },
 ]
+const prefixOptions = ['Herr', 'Frau', 'Divers', 'Dr.', 'Prof.']
 
 function emptyContact() {
   return {