Fix article generator producing 1xINTEL in GPU segment

MB_ lots (e.g. MB_INTEL_..._GPU8) are incorrectly categorized as GPU
in the pricelist. Two fixes:
- Skip MB_ lots in buildGPUSegment regardless of pricelist category
- Add INTEL to vendor token skip list in parseGPUModel (was missing,
  unlike AMD/NV/NVIDIA which were already skipped)

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

internal/article/generator.go

@@ -195,6 +195,9 @@ func buildGPUSegment(items []models.ConfigItem, cats map[string]string) string {
 		if !ok || group != GroupGPU {
 			continue
 		}
+		if strings.HasPrefix(strings.ToUpper(it.LotName), "MB_") {
+			continue
+		}
 		model := parseGPUModel(it.LotName)
 		if model == "" {
 			model = "UNK"
@@ -332,7 +335,7 @@ func parseGPUModel(lotName string) string {
 			continue
 		}
 		switch p {
-		case "NV", "NVIDIA", "AMD", "RADEON", "PCIE", "PCI", "SXM", "SXMX":
+		case "NV", "NVIDIA", "INTEL", "AMD", "RADEON", "PCIE", "PCI", "SXM", "SXMX":
 			continue
 		default:
 			if strings.Contains(p, "GB") {