fix(parser): support Inspur HGX dump_<serial>_<timestamp>/ onekeylog layout

Fixes #20. This onekeylog variant has no devicefrusdr.log at all: FRU/sensors
come from raw ipmitool text output, PCIe/GPU presence has a dedicated
structural snapshot, SEL lives at a different path, and BMC component
failures are logged separately from SEL/IDL.

- Fall back to component/fru.txt (same FRU block format as devicefrusdr.log)
  and component/sensor.txt / sdr.txt (ipmitool sensor list / sdr elist)
  when devicefrusdr.log is absent.
- Parse log/bmc/diagnose/OtrdDiagnoseComponent.json's PCIe Device Info array
  for GPU/PCIe presence and link state, independent of SEL/IDL alarm
  history; flag devices running below their negotiated max link
  speed/width as degraded with a Warning event.
- Fall back to log/sel.csv (same format as selelist.csv) when selelist.csv
  is absent.
- Parse log/bmc/commer-comp/{commerslot,commerhmc,commerswvr,commerswcpld}
  logs (including rotated *.tar.gz.N parts) into failure events, filtering
  known-noisy lines.
- Collapse SEL events duplicated across sources by
  (timestamp, event_type, description).
- Surface a CollectionError when FRU/sensors are still empty after all
  fallbacks, instead of silently returning an empty inventory.
- Fix ParseFRU: a later placeholder "Product Serial : 0" / "Product Part
  Number : NULL" line in the same FRU block (e.g. SCM_FRU) was overwriting
  an already-parsed real Board Serial/Part Number.

Verified against dump_23DB01633_20260727-1359.tar.gz (HGX B200, KR9288-X3):
fru 0→21, sensors 0→303, 8 GPUs present at Gen5 x16 in slots 100-107.

Deferred (not covered by this change): BIOS-change-settings context and
BIOS POST codes from the same layout — see bible-local/10-decisions.md
ADL-048.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/parser/vendors/inspur/fru.go

@@ -72,9 +72,16 @@ func ParseFRU(content []byte) []models.FRUInfo {
 					current.ProductName = fieldValue
 				}
 			case "Board Serial", "Product Serial":
-				current.SerialNumber = fieldValue
+				// Modules with no product-level FRU (e.g. SCM_FRU) report
+				// "Product Serial : 0" after a real "Board Serial" value;
+				// don't let the placeholder overwrite the real serial.
+				if fieldValue != "0" && fieldValue != "NULL" {
+					current.SerialNumber = fieldValue
+				}
 			case "Board Part Number", "Product Part Number":
-				if fieldValue != "0" {
+				// See "Board Serial" above: placeholder "NULL"/"0" product-level
+				// fields must not overwrite a real board-level part number.
+				if fieldValue != "0" && fieldValue != "NULL" {
 					current.PartNumber = fieldValue
 				}
 			case "Product Version":