perf(core): eliminate PHP session file lock contention on API/metrics, tune PHP-FPM pool, and remove redundant Keepalived restarts on sync

src/ClusterManager.php

@@ -564,13 +564,14 @@ class ClusterManager
             curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonPayload);
             curl_setopt($ch, CURLOPT_HTTPHEADER, [
                 'Content-Type: application/json',
+                'Expect:', // Désactive l'en-tête Expect: 100-continue pour éviter les blocages intermédiaires
                 'X-Nexus-Cluster-Signature: ' . $signature,
             ]);
             curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
             curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
             curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
-            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 4);
-            curl_setopt($ch, CURLOPT_TIMEOUT, 30);
+            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
+            curl_setopt($ch, CURLOPT_TIMEOUT, 20);
 
             $response = curl_exec($ch);
             $httpCode = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
@@ -754,9 +755,12 @@ class ClusterManager
             shell_exec('/usr/sbin/asterisk -rx "pjsip send unregister *" 2>/dev/null || true');
         }
 
-        // Si le cluster est actif, actualiser le service Keepalived
+        // Si le cluster est activé mais que Keepalived n'est pas encore démarré, le démarrer
         if (!empty($localClusterSettings['enabled'])) {
-            $this->applyKeepalivedConfig();
+            $keepalivedRunning = trim((string)shell_exec('pidof keepalived 2>/dev/null')) !== '';
+            if (!$keepalivedRunning) {
+                $this->applyKeepalivedConfig();
+            }
         }
 
         return [