Generic build for other GE sites: no WJ data, one shopfloor type, Windows USB builder

Everything West Jefferson specific moved out to a separate repo
(pxe-site-wj): NTLARS/UDC/heat-treat backups keyed by WJ machine numbers,
CMM and Wax/Trace bay lists, WJ OpenText profiles, site-config.json, the
WJ preinstall list, and the WJ shopfloor PC types (Collections,
NoCollections, Common, Keyence, CMM, Genspect, HeatTreat, Wax/Trace,
Display, PartMarker) with GE-Enforce, machine numbers and the desktop
layout. The part-marker bench tools moved to their own repo. Dead
scripts removed: build-proxmox-iso, deploy-bios, sync_hardware_models,
mirror-from-gold, pull-bios, startnet-template.cmd.

Shopfloor is one generic type, gea-shopfloor-standard, with today's
timing:
- PPKG at first logon (unattend Order 10, unchanged).
- Install-AppList.ps1 runs C:\PreInstall\preinstall.json during setup.
- A new SYSTEM task, GE Shopfloor Post-PPKG, runs postppkg.json once
  after the post-PPKG reboot. It also clears AutoLogonCount after the
  ShopFloor handover (the Users-level monitor can be denied that HKLM
  write) and removes the Intune Sync task when done.
- Both lists ship empty. A site adds entries and installers.
- WinPE choice 3 goes straight to the PPKG menu. Staging, fetch and heal
  carry only the generic payload. The webapp's shopfloor sub-menu editor
  is gone, and the imaging tiles name the new stages.
- The playbook deploys the empty lists only if missing. It now deploys
  the PowerShell 7 MSI the shopfloor unattend installs, which it never
  did before.

Blancco site settings move into the webapp (Updates > Blancco releases):
business location, licensing Wi-Fi SSID and password. They are rendered
into the served preferences.xml and applied to every staged release, and
are seeded from site-vars (site_name, blancco_wifi_ssid,
blancco_wifi_password) only while none exist. The repo XML carries no
site values; the plaintext Wi-Fi password is gone from it.

New site_name and site_timezone settings: report and evidence-pack site
name, server clock and webapp time zone. No more West Jefferson defaults
in webapp/config.py or the dashboard title. Sync-BPRT.ps1 gets the
server address filled in at download instead of WJ's GE address.

USB on Windows:
- scripts/Build-PxeUsb.ps1 runs the same checks as build-usb.sh. It
  writes one FAT32 CIDATA partition (ISO files plus patched grub.cfg plus
  payload) with diskpart and reads every file back by SHA-256.
- Tested with Windows PowerShell 5.1 in the win11 VM, and the layout
  installs and first-boots in the pxetest VM.
- scripts/stage-usb-share.sh stages the build folder on a share.
- site-content/ is optional for both builders.

KB docs/kb/How_To_Deploy_PXE_Server_New_Site.html: new-site deployment,
Windows only, with a site-vars.yml guide.

Checks: webapp tests pass (5 suites); the unattend lint and playbook
syntax checks pass; every .ps1 parses; there are no WJ hosts, IPs, names
or PC types in playbook/, webapp/, scripts/ or autoinstall/.

webapp/static/Sync-BPRT.ps1

@@ -79,8 +79,10 @@
 [CmdletBinding()]
 param(
     [string]$Source = 'C:\ProgramData\GEAerospace\MediaCenter\Cache\Deploy\Applications\BPRT',
-    [string]$WebUrl = 'http://10.134.48.170:9009',
-    [string]$SshHost = '10.134.48.170',
+    # Filled in with the address the page was opened from when the script is
+    # downloaded from the PXE webapp (Updates > BPRT sync); else pass them.
+    [string]$WebUrl = '',
+    [string]$SshHost = '',
     [string]$SshUser = 'pxe',
     [switch]$DryRun,
     [string]$ZipOut,
@@ -91,6 +93,9 @@ param(
 )
 
 $ErrorActionPreference = 'Stop'
+if (-not $WebUrl -or -not $SshHost) {
+    throw 'Give -WebUrl http://<PXE server>:9009 and -SshHost <PXE server> (or download this script from the PXE webapp, which fills them in).'
+}
 
 # The cache folder has also been seen under MediaCreator rather than
 # MediaCenter; try that one when the default is missing.