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_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)
 		}
 	}