Fix audit hang on SAS HBAs: skip scsi host scan for SAS hosts

Writing to /sys/class/scsi_host/hostX/scan on SAS controllers (e.g.
Adaptec smartpqi/PM8222-SHBA) triggers sas_user_scan which blocks
indefinitely, causing the audit to hang forever. Skip hosts that appear
under /sys/class/sas_host/ — SAS topology is discovered by the driver.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/collector/storage.go

@@ -36,6 +36,13 @@ func bestEffortRescanHotplugStorage() {
 		slog.Info("storage: scsi host scan skipped", "pattern", scsiHostScanGlob, "err", err)
 	} else {
 		for _, path := range hostPaths {
+			// SAS HBAs (e.g. smartpqi) block indefinitely in sas_user_scan when
+			// written to — SAS topology is discovered by the driver itself.
+			host := filepath.Base(filepath.Dir(path))
+			if _, err := os.Stat("/sys/class/sas_host/" + host); err == nil {
+				slog.Info("storage: scsi host scan skipped (SAS host)", "path", path)
+				continue
+			}
 			if err := hotplugWriteFile(path, []byte("- - -\n"), 0644); err != nil {
 				slog.Info("storage: scsi host scan write failed", "path", path, "err", err)
 				continue