fix: dedup GPUs across multiple chassis PCIeDevice trees in Redfish collector

Supermicro HGX exposes each GPU under both Chassis/1/PCIeDevices and a
dedicated Chassis/HGX_GPU_SXM_N/PCIeDevices. gpuDocDedupKey was keying
by @odata.id path, so identical GPUs with the same serial were not
deduplicated across sources. Now stable identifiers (serial → BDF →
slot+model) take priority over path.

Also includes Inspur parser improvements: NVMe model/serial enrichment
from devicefrusdr.log and audit.log, RAID drive slot normalization to
BP notation, PSU slot normalization, BMC/CPLD/VR firmware from RESTful
version info section, and parser version bump to 1.8.

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

internal/parser/vendors/inspur/asset_gpu_model_test.go

@@ -28,7 +28,7 @@ func TestParseAssetJSON_NVIDIAGPUModelFromPCIIDs(t *testing.T) {
 		}]
 	}`)
 
-	hw, err := ParseAssetJSON(raw)
+	hw, err := ParseAssetJSON(raw, nil, nil)
 	if err != nil {
 		t.Fatalf("ParseAssetJSON failed: %v", err)
 	}