Add production warning to 'Both IOM1 and IOM2' firmware update option

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

modules/workflow_firmware.py

@@ -235,7 +235,7 @@ def firmware_update_workflow():
     print("  Which IOM(s) would you like to update?")
     print(f"    {_c(C.BOLD, '1')}  IOM1 only")
     print(f"    {_c(C.BOLD, '2')}  IOM2 only")
-    print(f"    {_c(C.BOLD, '3')}  Both IOM1 and IOM2")
+    print(f"    {_c(C.BOLD, '3')}  Both IOM1 and IOM2  {_c(C.YEL, '(Do not use on production systems)')}")
     print()
 
     while True: