feat: refresh stale last pickup information

Track the successful member-list check time and refresh stale pickup information
asynchronously after the GUI loads without triggering dormant warnings.

server.js

@@ -12,6 +12,7 @@ const {
   runStoreWatchCheck,
   runImmediatePickupCheck,
   runDormantMembershipCheck,
+  refreshStaleLastPickupInfo,
   getRegularPickupSchedule,
   scheduleRegularPickupRefresh
 } = require('./services/pickupScheduler');
@@ -1424,6 +1425,16 @@ app.post('/api/config/check', requireAuth, (req, res) => {
   res.json({ success: true });
 });
 
+app.post('/api/config/last-pickup/refresh', requireAuth, async (req, res) => {
+  try {
+    const result = await refreshStaleLastPickupInfo(req.session.id);
+    res.json({ success: true, ...result });
+  } catch (error) {
+    console.error('[PICKUP] Letzte Abholung konnte nicht aktualisiert werden:', error.message);
+    res.status(502).json({ error: 'Letzte Abholung konnte nicht aktualisiert werden.' });
+  }
+});
+
 app.get('/api/pickups/registered', requireAuth, async (req, res) => {
   try {
     const pickups = await withSessionRetry(