collector/redfish: fix server model fallback and GPU/NVMe regressions

internal/collector/redfish_replay.go

@@ -448,7 +448,7 @@ func dedupeStrings(items []string) []string {
 func (r redfishSnapshotReader) collectBoardFallbackDocs(chassisPaths []string) []map[string]interface{} {
 	out := make([]map[string]interface{}, 0)
 	for _, chassisPath := range chassisPaths {
-		for _, suffix := range []string{"/Boards", "/Backplanes", "/Assembly"} {
+		for _, suffix := range []string{"/Boards", "/Backplanes"} {
 			path := joinPath(chassisPath, suffix)
 			if docs, err := r.getCollectionMembers(path); err == nil && len(docs) > 0 {
 				out = append(out, docs...)
@@ -468,6 +468,9 @@ func applyBoardInfoFallbackFromDocs(board *models.BoardInfo, docs []map[string]i
 	}
 	for _, doc := range docs {
 		candidate := parseBoardInfoFromFRUDoc(doc)
+		if !isLikelyServerProductName(candidate.ProductName) {
+			continue
+		}
 		if board.Manufacturer == "" {
 			board.Manufacturer = candidate.Manufacturer
 		}
@@ -486,6 +489,27 @@ func applyBoardInfoFallbackFromDocs(board *models.BoardInfo, docs []map[string]i
 	}
 }
 
+func isLikelyServerProductName(v string) bool {
+	v = strings.TrimSpace(v)
+	if v == "" {
+		return false
+	}
+	n := strings.ToUpper(v)
+	if strings.Contains(n, "NULL") {
+		return false
+	}
+	componentTokens := []string{
+		"DIMM", "DDR", "NVME", "SSD", "HDD", "GPU", "NIC", "RAID",
+		"PSU", "FAN", "BACKPLANE", "FRU",
+	}
+	for _, token := range componentTokens {
+		if strings.Contains(n, strings.ToUpper(token)) {
+			return false
+		}
+	}
+	return true
+}
+
 type redfishSnapshotReader struct {
 	tree map[string]interface{}
 }
@@ -918,7 +942,7 @@ func (r redfishSnapshotReader) collectGPUs(systemPaths, chassisPaths []string) [
 			out = append(out, gpu)
 		}
 	}
-	return out
+	return dropModelOnlyGPUPlaceholders(out)
 }
 
 func (r redfishSnapshotReader) collectPCIeDevices(systemPaths, chassisPaths []string) []models.PCIeDevice {