feat: add disks to monitoring

hosts/nas/modules/disk-monitoring.nix

@@ -44,12 +44,16 @@ let
         continue
       fi
 
-      # Resolve symlink to get actual device
+      # Resolve symlink to get actual device (needed for hdparm/smartctl)
       device=$(readlink -f "$disk")
-      short_name=$(basename "$device")
 
-      # Extract serial from disk ID for labels (part after last underscore)
-      serial=$(basename "$disk" | sed 's/.*_//')
+      # Extract model+serial from disk-by-id path for stable labeling
+      # ata-ST18000NM000J-2TV103_ZR52TBSB → ST18000NM000J-2TV103-ZR52TBSB
+      # nvme-KIOXIA-EXCERIA_PLUS_G3_SSD_7FJKS1MAZ0E7 → KIOXIA-EXCERIA_PLUS_G3_SSD-7FJKS1MAZ0E7
+      disk_id=$(basename "$disk")
+      serial=$(echo "$disk_id" | sed 's/.*_//')
+      model=$(echo "$disk_id" | sed 's/^[^-]*-//; s/_[^_]*$//')
+      short_name="$model-$serial"
 
       # Check power state without waking disk
       power_state=$(${pkgs.hdparm}/bin/hdparm -C "$device" 2>/dev/null | grep -oP '(standby|active/idle|active|idle)' | head -1 || echo "unknown")