fix: Close stdin before while loop to prevent hang when piped from curl

agents/proxmox_auto_enroll.sh

@@ -106,6 +106,9 @@ enrolled_count=0
 skipped_count=0
 failed_count=0
 
+# Close stdin to prevent any interference when piped from curl
+exec 0<&-
+
 # ===== PROCESS CONTAINERS =====
 while IFS= read -r line; do
     vmid=$(echo "$line" | awk '{print $1}')