Fix fabric firmware version path — add VikingEnterpriseSolutions key

The Redfish response nests the version under
Oem.VikingEnterpriseSolutions.Version.ActiveFirmwareVersion, not
Oem.Version.ActiveFirmwareVersion. Fixed in both redfish.py
(_get_fabric_fw_version, used by network check and firmware workflow)
and workflow_check.py (serial inline parsing).

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

modules/redfish.py

@@ -208,6 +208,7 @@ def _get_fabric_fw_version(password: str, host: str, iom: str) -> str:
     )
     if ok_flag and isinstance(data, dict):
         version = (data.get("Oem", {})
+                       .get("VikingEnterpriseSolutions", {})
                        .get("Version", {})
                        .get("ActiveFirmwareVersion"))
         return version or "Unknown"