feat(network.js): Logout-Anforderungsmethode hinzugefügt.

- Logout-Methode zum LOGOUT-Ereignis hinzugefügt

EnvelopeGenerator.Web/wwwroot/js/network.js

@@ -194,4 +194,13 @@ async function setLanguage(language) {
             else if (!response.ok)
                 return Promise.reject('Failed to set language');
         });
+}
+
+async function logout() {
+    return await fetch(`/auth/logout`, {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json'
+        }
+    });
 }