feat(cluster): add configurable BLF expiry interval in HA menu with 120s default and automatic check-sync notify on failover

public/assets/app.js

@@ -6394,6 +6394,33 @@ async function refreshClusterStatus() {
         const secretInput = document.getElementById('cluster-secret');
         if (secretInput && st.cluster_secret) secretInput.value = st.cluster_secret;
 
+        const blfExpiryContainer = document.getElementById('cluster-blf-expiry-container');
+        const blfExpiryInput = document.getElementById('cluster-blf-expiry');
+        if (blfExpiryContainer && blfExpiryInput) {
+            if (st.enabled) {
+                blfExpiryContainer.classList.remove('hidden');
+                blfExpiryInput.value = st.blf_expiry || 120;
+            } else {
+                blfExpiryContainer.classList.add('hidden');
+                blfExpiryInput.value = st.blf_expiry || 1800;
+            }
+        }
+
+        if (chkEnabled && !chkEnabled.dataset.blfBound) {
+            chkEnabled.dataset.blfBound = '1';
+            chkEnabled.addEventListener('change', () => {
+                const c = document.getElementById('cluster-blf-expiry-container');
+                const inp = document.getElementById('cluster-blf-expiry');
+                if (chkEnabled.checked) {
+                    if (c) c.classList.remove('hidden');
+                    if (inp && (!inp.value || inp.value === '1800')) inp.value = 120;
+                } else {
+                    if (c) c.classList.add('hidden');
+                    if (inp) inp.value = 1800;
+                }
+            });
+        }
+
         // Badges & Cartes
         const headerBadge = document.getElementById('cluster-header-state-badge');
         const navBadge = document.getElementById('nav-badge-cluster');
@@ -6584,6 +6611,7 @@ async function saveClusterSettings(e) {
         peer_port: parseInt(form.elements['peer_port'] ? form.elements['peer_port'].value : 8443, 10) || 8443,
         cluster_secret: form.elements['cluster_secret'].value.trim(),
         vrid: parseInt(form.elements['vrid'].value, 10) || 51,
+        blf_expiry: parseInt(form.elements['blf_expiry'] ? form.elements['blf_expiry'].value : 120, 10) || 120,
         auto_sync: form.elements['auto_sync'].checked ? 1 : 0
     };