fix: include model number and ADA suffix in GPU article token

RTX 6000 ADA and A6000 are distinct cards — RTX_4000_ADA_SFF now
produces RTX4000ADA instead of RTX, avoiding visual ambiguity with
the segment separator (10xRTX4000ADA vs 10xRTX-1x…).

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

internal/article/generator.go

@@ -329,33 +329,57 @@ func parseGPUModel(lotName string) string {
 	}
 	parts := strings.Split(upper, "_")
 	model := ""
+	numSuffix := ""
 	mem := ""
 	for i, p := range parts {
 		if p == "" {
 			continue
 		}
 		switch p {
-		case "NV", "NVIDIA", "INTEL", "AMD", "RADEON", "PCIE", "PCI", "SXM", "SXMX":
+		case "NV", "NVIDIA", "INTEL", "AMD", "RADEON", "PCIE", "PCI", "SXM", "SXMX", "SFF", "LOVELACE", "AMPERE", "HOPPER":
+			continue
+		case "ADA":
+			if model != "" {
+				numSuffix += "ADA"
+			}
 			continue
 		default:
 			if strings.Contains(p, "GB") {
 				mem = p
 				continue
 			}
-			if model == "" && (i > 0) {
+			if model == "" && i > 0 {
 				model = p
+			} else if model != "" && numSuffix == "" && isNumeric(p) {
+				numSuffix = p
 			}
 		}
 	}
-	if model != "" && mem != "" {
-		return model + "_" + mem
+	full := model
+	if numSuffix != "" {
+		full = model + numSuffix
 	}
-	if model != "" {
-		return model
+	if full != "" && mem != "" {
+		return full + "_" + mem
+	}
+	if full != "" {
+		return full
 	}
 	return normalizeModelToken(lotName)
 }
 
+func isNumeric(s string) bool {
+	if s == "" {
+		return false
+	}
+	for _, r := range s {
+		if r < '0' || r > '9' {
+			return false
+		}
+	}
+	return true
+}
+
 func parseMemGiB(lotName string) int {
 	if m := reMemTiB.FindStringSubmatch(lotName); len(m) == 3 {
 		return atoi(m[1]) * 1024