fix: prevent context leak in temperature collection

- Use defer for tempCancel() to ensure context is always cancelled
- Remove redundant shouldCollect variable that was always true
- Fix indentation after removing the unnecessary conditional block

internal/monitoring/monitor_polling.go

@@ -2087,12 +2087,12 @@ func (m *Monitor) pollPVENode(
 	}
 	if effectiveStatus == "online" && m.tempCollector != nil && tempMonitoringEnabled {
 		tempCtx, tempCancel := context.WithTimeout(ctx, 30*time.Second) // Increased to accommodate SSH operations via proxy
+		defer tempCancel()
 
 		// Determine SSH hostname to use (most robust approach):
 		// Prefer the resolved host for this node, with cluster overrides when available.
 		sshHost := modelNode.Host
 		foundNodeEndpoint := false
-		shouldCollect := true
 
 		if modelNode.IsClusterMember && instanceCfg.IsCluster {
 			// Try to find specific endpoint configuration for this node
@@ -2119,14 +2119,12 @@ func (m *Monitor) pollPVENode(
 			}
 		}
 
-		if shouldCollect {
 		if strings.TrimSpace(sshHost) == "" {
 			sshHost = node.Node
 		}
 
 		// Use HTTP proxy if configured for this instance, otherwise fall back to socket/SSH
 		temp, err := m.tempCollector.CollectTemperatureWithProxy(tempCtx, sshHost, node.Node, instanceCfg.TemperatureProxyURL, instanceCfg.TemperatureProxyToken)
-			tempCancel()
 
 		if err == nil && temp != nil && temp.Available {
 			// Get the current CPU temperature (prefer package, fall back to max)
@@ -2196,7 +2194,6 @@ func (m *Monitor) pollPVENode(
 				Msg("Temperature data unavailable after collection")
 		}
 	}
-	}
 
 	if m.pollMetrics != nil {
 		nodeNameLabel := strings.TrimSpace(node.Node)