migrated timetable integration from WebUntis to the MarianumConnect API, implementing a Dio-based client with bearer token authentication, background session validation, and auto-refresh logic.

lib/model/endpoint_data.dart

@@ -37,14 +37,6 @@ class EndpointData {
         : EndpointMode.live;
   }
 
-  Endpoint webuntis() => EndpointOptions(
-    live: Endpoint(domain: 'marianum-fulda.webuntis.com'),
-    staged: Endpoint(
-      domain: 'mhsl.eu',
-      path: '/marianum/marianummobile/webuntis/public/index.php/api',
-    ),
-  ).get(getEndpointMode());
-
   Endpoint nextcloud() => EndpointOptions(
     live: Endpoint(domain: 'cloud.marianum-fulda.de'),
     staged: Endpoint(domain: 'mhsl.eu', path: '/marianum/marianummobile/cloud'),