storage SAT: fix NVMe SMART counters showing 0 for power-on hours/read/write

nvme-cli emits large 64-bit counters as JSON-quoted strings on some
versions; the disk-report text generator only handled bare numbers and
{lo,hi} objects, so power_on_hours/data_units_read/data_units_written
etc. silently parsed as 0 while the structured collector path already
handled this correctly. Unify both paths on a single exported
JSONInt64/NVMeSmartLog/NVMeIDCtrl type in collector/storage.go instead
of keeping two independent nvme-cli JSON parsers in sync.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

audit/internal/collector/raid.go

@@ -766,7 +766,7 @@ func parseMDAdmPlatformLicense(raw string) *string {
 
 func queryDeviceSerial(devPath string) string {
 	if out, err := exec.Command("nvme", "id-ctrl", devPath, "-o", "json").Output(); err == nil {
-		var ctrl nvmeIDCtrl
+		var ctrl NVMeIDCtrl
 		if json.Unmarshal(out, &ctrl) == nil {
 			if v := cleanDMIValue(strings.TrimSpace(ctrl.SerialNumber)); v != "" {
 				return v