fix(exporter): preserve all HGX GPUs with generic PCIe slot name

Supermicro HGX BMC reports all 8 B200 GPU PCIe devices with Name
"PCIe Device" — a generic label shared by every GPU, not a unique
hardware position. pcieDedupKey used slot as the primary key, so all
8 GPUs collapsed to one entry in the UI (the first, serial 1654925165720).

Add isGenericPCIeSlotName to detect non-positional slot labels and fall
through to serial/BDF for dedup instead, preserving each GPU separately.
Positional slots (#GPU0, SLOT-NIC1, etc.) continue to use slot-first dedup.

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

internal/exporter/reanimator_converter_test.go

@@ -733,6 +733,42 @@ func TestConvertPCIeDevices_SkipsDisplayControllerDuplicates(t *testing.T) {
 	}
 }
 
+func TestConvertPCIeDevices_PreservesAllGPUsWithGenericSlot(t *testing.T) {
+	// Supermicro HGX BMC reports all GPU PCIe devices with Name "PCIe Device" —
+	// a generic label that is not a unique hardware position. All 8 GPUs must
+	// be preserved; dedup by generic slot name must not collapse them into one.
+	gpus := make([]models.GPU, 8)
+	serials := []string{
+		"1654925165720", "1654925166160", "1654925165942", "1654925165271",
+		"1654925165719", "1654925165252", "1654925165304", "1654925165587",
+	}
+	for i, sn := range serials {
+		gpus[i] = models.GPU{
+			Slot:         "PCIe Device",
+			Model:        "B200 180GB HBM3e",
+			Manufacturer: "NVIDIA",
+			SerialNumber: sn,
+			PartNumber:   "2901-886-A1",
+			Status:       "OK",
+		}
+	}
+	hw := &models.HardwareConfig{GPUs: gpus}
+	result := convertPCIeDevices(hw, "2026-04-13T10:00:00Z")
+	if len(result) != 8 {
+		t.Fatalf("expected 8 GPU entries (one per serial), got %d", len(result))
+	}
+	seen := make(map[string]bool)
+	for _, r := range result {
+		if seen[r.SerialNumber] {
+			t.Fatalf("duplicate serial %q in PCIe result", r.SerialNumber)
+		}
+		seen[r.SerialNumber] = true
+		if r.DeviceClass != "VideoController" {
+			t.Fatalf("expected VideoController device class, got %q", r.DeviceClass)
+		}
+	}
+}
+
 func TestConvertPCIeDevices_MapsGPUStatusHistory(t *testing.T) {
 	hw := &models.HardwareConfig{
 		GPUs: []models.GPU{