Add unified FRU/Elabel card with Huawei iBMC OEM IPMI support

Replaces separate IPMI FRU and SAA DMI cards with a single FRU / Elabel
card that reads all available sources in parallel and shows each field
with a color-coded source chip (IPMI FRU / Huawei iBMC / SAA DMI).

Huawei elabel fields are read/written via OEM IPMI raw commands
(NetFn 0x30, cmd 0x90) with 19-byte chunking protocol, matching
the FusionServer ElabelTool V511 wire format. Covers DeviceName,
DeviceSerialNumber, ProductName, ProductSerialNumber, ProductAssetTag,
ProductManufacturer, MainboardManufacturer, BoardProductName,
ChassisPartnumber, ChassisType (read-only), IOChassisSerial,
IOChassisAssetTag, and GUID (read-only via standard 0x06 0x08).

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

audit/internal/webui/task_runner.go

@@ -394,6 +394,12 @@ func executeTaskWithOptions(opts *HandlerOptions, t *Task, j *jobState, ctx cont
 			break
 		}
 		err = runIPMIFRUWriteTask(ctx, j, opts.ExportDir, t.params)
+	case "huawei-elabel-write":
+		if len(t.params.HuaweiElabelChanges) == 0 {
+			err = fmt.Errorf("no changes provided")
+			break
+		}
+		err = runHuaweiElabelWriteTask(ctx, j, t.params)
 	case "raid-foreign-clear":
 		err = runRAIDForeignClearTask(ctx, j, t.params.RAIDController)
 	case "raid-foreign-import":