Initial commit — bootstrapped from es24n-conf (TrueNAS/Linux edition)

Starting point for Windows packaging. Serial backend will be replaced
with pyserial; PyInstaller used to produce a standalone .exe.

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

es24n_conf.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+"""
+ES24N IOM Network Configuration Tool
+TrueNAS ES24N Expansion Shelf — Serial Configuration Utility
+Based on ES24N Product Service Guide v.26011
+
+Zero external dependencies — Python 3 standard library only.
+Compatible with TrueNAS (FreeBSD) and Linux.
+
+Usage:
+    python3 es24n_conf.py
+
+All files in the modules/ subdirectory must be present:
+    ui.py, serial_port.py, models.py, redfish.py,
+    workflow_serial.py, workflow_firmware.py, workflow_check.py
+"""
+
+import os
+import sys
+import time
+
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "modules"))
+
+from ui import _c, C, banner, draw_box, ok, warn, prompt
+from workflow_check import system_check_workflow
+from workflow_firmware import firmware_update_workflow
+from workflow_restart import restart_iom_workflow
+from workflow_serial import configure_shelf
+
+
+def main():
+    while True:
+        banner()
+        draw_box([
+            f"  {_c(C.BOLD, '1')}  Configure Network Settings",
+            f"  {_c(C.BOLD, '2')}  Update IOM / Fabric Card Firmware",
+            f"  {_c(C.BOLD, '3')}  Query Current Configuration",
+            f"  {_c(C.BOLD, '4')}  Restart IOM",
+            f"  {_c(C.BOLD, '5')}  Exit",
+        ])
+        print()
+
+        choice = prompt("Select [1-5]")
+        if choice == "1":
+            another = True
+            while another:
+                another = configure_shelf()
+        elif choice == "2":
+            firmware_update_workflow()
+        elif choice == "3":
+            system_check_workflow()
+        elif choice == "4":
+            restart_iom_workflow()
+        elif choice == "5":
+            break
+        else:
+            warn("Please enter 1, 2, 3, 4, or 5.")
+            time.sleep(1)
+
+    print()
+    ok("Exiting ES24N IOM Configuration Tool. Goodbye.")
+    print()
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except KeyboardInterrupt:
+        print()
+        warn("Interrupted. Exiting.")
+        sys.exit(0)