Associate password with each shelf for multi-shelf firmware updates

Each ES24N shelf has a unique Admin password (its BMC serial number), so a
single shared password is incorrect for multi-shelf runs. The password prompt
now appears once per shelf inside _collect_shelves(), stored as the first
element of each (password, [(iom, ip), ...]) shelf tuple. _make_targets()
threads the password into each (label, iom, ip, password) target entry, and
_show_fw_versions() uses the per-target password instead of a global one.

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

modules/redfish.py

@@ -214,17 +214,18 @@ def _get_fabric_fw_version(password: str, host: str, iom: str) -> str:
     return _c(C.RED, "Unreachable")
 
 
-def _show_fw_versions(password: str, targets: list):
+def _show_fw_versions(targets: list):
     """
     Query and display firmware versions.
-    targets: list of (label, iom, ip) tuples where
-      label: display string (e.g. "IOM1", "S1 / IOM1")
-      iom:   actual IOM name used in Redfish paths ("IOM1" or "IOM2")
-      ip:    management IP address
+    targets: list of (label, iom, ip, password) tuples where
+      label:    display string (e.g. "IOM1", "S1 / IOM1")
+      iom:      actual IOM name used in Redfish paths ("IOM1" or "IOM2")
+      ip:       management IP address
+      password: Admin password for this shelf
     """
     info("Querying firmware versions...")
     rows = []
-    for label, iom, ip in targets:
+    for label, iom, ip, password in targets:
         iom_ver    = _get_iom_fw_version(password, ip, iom)
         fabric_ver = _get_fabric_fw_version(password, ip, iom)
         rows.append([label, ip, iom_ver, fabric_ver])