new calculation approach with unique sessions, new API endpoint to get list of active sessions, fix for UNDEF user, UI and Back to support certificate management still under development

UI/client/src/views/Clients.vue

@@ -36,7 +36,7 @@
   </div>
 
   <div class="card">
-    <div class="card-header d-flex justify-content-between align-items-center bg-transparent border-bottom">
+    <div class="card-header d-flex justify-content-between align-items-center">
       <span><i class="fas fa-network-wired me-2"></i>Clients List</span>
       <small class="text-muted">Updated: {{ lastUpdated }}</small>
     </div>
@@ -121,9 +121,9 @@ import { useFormatters } from '../composables/useFormatters';
 import HistoryModal from '../components/HistoryModal.vue';
 import { useAppConfig } from '../composables/useAppConfig';
 
-const { fetchStats } = useApi();
+const { fetchStats, apiClient } = useApi();
 const { formatBytes, formatRate, parseServerDate } = useFormatters();
-const { config } = useAppConfig(); // To get refresh interval
+const { config } = useAppConfig();
 
 const clients = ref([]);
 const loading = ref(true);