redfish: filter PCIe topology noise, deduplicate GPU/NIC cross-sources

- isUnidentifiablePCIeDevice: skip PCIe entries with generic class
  (SingleFunction/MultiFunction) and no model/serial/VendorID — eliminates
  PCH bridges, root ports and other bus infrastructure that MSI BMC
  enumerates exhaustively (59→9 entries on CG480-S5063)
- collectPCIeDevices: skip entries where looksLikeGPU — prevents GPU
  devices from appearing in both hw.GPUs and hw.PCIeDevices (fixed
  Inspur H100 duplicate)
- dedupeCanonicalDevices: secondary model+manufacturer match for noKey
  items (no serial, no BDF) — merges NetworkAdapter entries into
  matching PCIe device entries; isGenericDeviceClass helper for
  DeviceClass identity check (fixed Inspur ENFI1100-T4 duplicate)

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

internal/collector/redfish.go

@@ -720,7 +720,13 @@ func (c *RedfishConnector) collectPCIeDevices(ctx context.Context, client *http.
 
 		for _, doc := range memberDocs {
 			functionDocs := c.getLinkedPCIeFunctions(ctx, client, req, baseURL, doc)
+			if looksLikeGPU(doc, functionDocs) {
+				continue
+			}
 			dev := parsePCIeDevice(doc, functionDocs)
+			if isUnidentifiablePCIeDevice(dev) {
+				continue
+			}
 			out = append(out, dev)
 		}
 	}
@@ -2975,6 +2981,27 @@ func isMissingOrRawPCIModel(model string) bool {
 	return false
 }
 
+// isUnidentifiablePCIeDevice returns true for PCIe topology entries that carry no
+// useful inventory information: generic class (SingleFunction/MultiFunction), no
+// resolved model or serial, and no PCI vendor/device IDs for future resolution.
+// These are typically PCH bridges, root ports, or other bus infrastructure that
+// some BMCs (e.g. MSI) enumerate exhaustively in their PCIeDevices collection.
+func isUnidentifiablePCIeDevice(dev models.PCIeDevice) bool {
+	if !isGenericPCIeClassLabel(dev.DeviceClass) {
+		return false
+	}
+	if normalizeRedfishIdentityField(dev.PartNumber) != "" {
+		return false
+	}
+	if normalizeRedfishIdentityField(dev.SerialNumber) != "" {
+		return false
+	}
+	if dev.VendorID > 0 || dev.DeviceID > 0 {
+		return false
+	}
+	return true
+}
+
 func isGenericPCIeClassLabel(v string) bool {
 	switch strings.ToLower(strings.TrimSpace(v)) {
 	case "", "pcie device", "display", "display controller", "vga", "3d controller", "network", "network controller", "storage", "storage controller", "other", "unknown", "singlefunction", "multifunction", "simulated":

internal/collector/redfish_replay.go

@@ -1261,7 +1261,13 @@ func (r redfishSnapshotReader) collectPCIeDevices(systemPaths, chassisPaths []st
 		}
 		for _, doc := range memberDocs {
 			functionDocs := r.getLinkedPCIeFunctions(doc)
+			if looksLikeGPU(doc, functionDocs) {
+				continue
+			}
 			dev := parsePCIeDevice(doc, functionDocs)
+			if isUnidentifiablePCIeDevice(dev) {
+				continue
+			}
 			out = append(out, dev)
 		}
 	}