Fix NVMe SMART status always Unknown; fix GPU count including NVSwitches

nvme-cli emits smart-log counters as JSON strings and uses field names
avail_spare / percent_used instead of the prose names in the NVMe spec.
The nvmeSmartLog struct had int64 fields with wrong JSON tags — Unmarshal
returned an error and the whole health block was skipped, leaving every
NVMe drive with status=Unknown.

Fix: switch all numeric fields to jsonInt64 (already used for lsblk
block sizes) which accepts both bare numbers and quoted strings, and
correct the avail_spare / percent_used tag names.

Also fix validateIsVendorGPU for NVIDIA: previously counted any NVIDIA
PCIe device (including NVSwitch bridges) as a GPU, producing wrong
estimates (12 instead of 8 on an HGX H100 system). Now requires
device_class to be videocontroller or processingaccelerator, matching
the existing AMD filter logic.

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

audit/internal/collector/storage_health_test.go

@@ -1,11 +1,65 @@
 package collector
 
 import (
+	"encoding/json"
 	"testing"
 
 	"bee/audit/internal/schema"
 )
 
+// TestNVMeSmartLogUnmarshal verifies that nvme-cli JSON output (where most
+// counters are quoted strings and field names differ from NVMe spec prose)
+// is correctly parsed into nvmeSmartLog.
+func TestNVMeSmartLogUnmarshal(t *testing.T) {
+	t.Parallel()
+
+	// Real nvme-cli output: counters are JSON strings, spare is "avail_spare",
+	// percentage used is "percent_used".
+	raw := `{
+		"critical_warning": 0,
+		"temperature": 310,
+		"avail_spare": 100,
+		"spare_thresh": 5,
+		"percent_used": 0,
+		"data_units_read": "10925415",
+		"data_units_written": "8497672",
+		"controller_busy_time": "305",
+		"power_cycles": "53",
+		"power_on_hours": "49",
+		"unsafe_shutdowns": "22",
+		"media_errors": "0",
+		"num_err_log_entries": "0"
+	}`
+	var log nvmeSmartLog
+	if err := json.Unmarshal([]byte(raw), &log); err != nil {
+		t.Fatalf("json.Unmarshal failed: %v", err)
+	}
+	if log.PowerOnHours != 49 {
+		t.Errorf("PowerOnHours=%d want 49", log.PowerOnHours)
+	}
+	if log.PowerCycles != 53 {
+		t.Errorf("PowerCycles=%d want 53", log.PowerCycles)
+	}
+	if log.AvailableSpare != 100 {
+		t.Errorf("AvailableSpare=%d want 100", log.AvailableSpare)
+	}
+	if log.SpareThreshold != 5 {
+		t.Errorf("SpareThreshold=%d want 5", log.SpareThreshold)
+	}
+	if log.PercentageUsed != 0 {
+		t.Errorf("PercentageUsed=%d want 0", log.PercentageUsed)
+	}
+	if log.Temperature != 310 {
+		t.Errorf("Temperature=%d want 310", log.Temperature)
+	}
+	if log.MediaErrors != 0 {
+		t.Errorf("MediaErrors=%d want 0", log.MediaErrors)
+	}
+	if log.UnsafeShutdowns != 22 {
+		t.Errorf("UnsafeShutdowns=%d want 22", log.UnsafeShutdowns)
+	}
+}
+
 func TestSetStorageHealthStatus(t *testing.T) {
 	t.Parallel()