sync with labv2.nix + standalone flake with toDisk app

Previous history (https://git.sagar.ch/dotfiles/labv2.nix/commits/branch/master/modules/apps/vmix):
- c359054 daku working!
- 8de5cff fix integer overflow in vmix network lib
- 9c25a66 daku on 25.05. with ollama
- 385a3bf vmix enables relaxed sandbox
- c363da1 restructure vmixLib into linux/windows subattrs with OS-specific customizeImage
- edd4dc2 vmix: port namespace model and module improvements from conf.nix
- 6666ecf vmix: add SPICE support, install virtio guest tools with SPICE agent
- 46f5671 vmix: add QEMU guest agent channel for Windows VMs
- e1fea34 vmix: add Win11 LTSC 2024 image, refactor VirtIO driver selection
- c27ae68 vmix: make customizeImage chroot-sandboxed by default, opt-in impure
- 305fbac virt customize needs chroot for now due to usr bin env things. could be fixed later
- 264d30f vmix: add win10 VM on desk, disable SMB signing for guest Samba access
- 9b64f51 vmix: split Windows templates into per-category files, add comprehensive debloat
- ef91bf8 vmix: fix missing parent registry keys in Windows templates
- f87f340 win10 VM on panda with AMD GPU + USB passthrough
- 38e474f vmix: split Windows build into Audit Mode install + composable templates
- a6a8db3 vmix: win11 support, remove build VNC, switch VMs to SPICE
- 6cf5a21 generalize stage sets bg color, accent color and sets visual effects to performance
- a84849f remove rdp template since it doesn't even work
- 5245263 vmix: best performance template + generalize cleanup
- ab12dd3 vmix: use CopyProfile for best performance visual effects
- bce3326 vmix: CopyProfile for best performance visual effects
- 2496107 vmix: add app templates (7zip, VLC, ImageGlass, Edge WebView, VC++ runtimes)
- 29a6123 wip: debug default associations xml
- 2a2e5f5 vmix: fix DefaultAssociations.xml cmd.exe escaping
- cc6ff9d vmix: move DefaultAssociations.xml to template only
- a4a78ec vmix: add removeWMP template to remove Windows Media Player
- 3fe56de vmix: improved Edge removal (files, shortcuts, scheduled tasks)
- a491767 vmix: fully remove Edge via post-oobe AppxPackage removal
- 6ca1619 vmix: remove Edge DevToolsClient SystemApps + AppxPackage
- 0c1ec35 vmix: sandboxie windows app template
- 628bbd2 vmix: add Sandboxie-Plus template
- f055a41 vmix: reorganize templates, add file associations, remove Paint
- 34326f4 vmix: set Thorium as default browser via PS-SFTA in post-oobe
- 86af258 vmix: Active Setup for default browser (all users, no post-oobe needed)
- 35b8cb0 remove vnc display from thorium template
- c7e0af6 vmix: fix Win11 generalize timeout + UCPD disable for URL associations
- 43a1345 vmix: add Office 2024 template + Ohook activation in generalize
- 03bbce0 vmix: updated office installation xml. more privacy options enabled
- 790a0ee vmix: thorium installation - hide SFTA window
- a0e5c18 vmix: fix office install.bat call + add privacy registry policies
- 3df38ca vmix: fix Ohook activation + suppress Office theme dialog
- df39ba3 vmix: remove sandboxie shortcut from desktop
- 50d5972 vmix: skip Sandboxie desktop shortcut via installer flag
- ee2fa0f vmix: fix win10 default browser
- 938315b vmix: windows: set accent color to automatic. remove accent color from unnecessary elements
- beceda8 vmix: allow ISO-only VMs without OS disk, add WinPE VM to panda

Flake outputs: overlays.default, nixosModules.default, lib, apps.toDisk

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/images/windows/helpers/makeImage.nix

@@ -0,0 +1,69 @@
+# Build a pre-installed Windows qcow2 image using QEMU unattended install.
+# Boots into Audit Mode after install and shuts down.
+# Apply templates via customizeImageFold to install software (auditScript)
+# and customize registry (windowsRegistry), then generalize when done.
+{ pkgs, lib, drivers, makeWinISO, makeAuditModeAutounattend, ... }:
+{
+  name ? "windows",
+  upstreamISO,
+  productKey ? "",
+  imageIndex ? 1,
+  diskSize ? "64G",
+  bypassRequirements ? false,
+  locale ? "en-US",
+  efi ? true,
+  smp ? 4,
+  memSize ? 4096,
+  vncDisplay ? null,  # e.g. ":10" to enable VNC on port 5910 for monitoring
+  windowsVersionForVirtioDrivers ? "w10",  # "w10", "w11", "2k22", "2k19", etc.
+}:
+let
+  AutounattendedXml = makeAuditModeAutounattend {
+    inherit locale productKey imageIndex
+            efi bypassRequirements windowsVersionForVirtioDrivers;
+    diskIndex = 0;
+    virtioDriverLetter = "E";
+  };
+
+  iso = makeWinISO {
+    iso = upstreamISO;
+    inherit AutounattendedXml;
+  };
+
+  drv = pkgs.runCommand "${name}-vmix.qcow2" {
+    __noChroot = true;
+    requiredSystemFeatures = [ "kvm" ];
+    nativeBuildInputs = with pkgs; [ qemu ];
+  } ''
+    # create empty disk
+    qemu-img create -f qcow2 disk.qcow2 ${diskSize}
+
+    # writable UEFI NVRAM so boot order persists across reboots
+    cp ${pkgs.OVMF.fd}/FV/OVMF_VARS.fd vars.fd
+    chmod +w vars.fd
+
+    echo "=== Starting Windows unattended install (this takes 15-30 minutes) ==="
+
+    # Windows installs unattended, reboots into Audit Mode,
+    # deletes cached Autounattend, shuts down → QEMU exits.
+    timeout 3600 qemu-system-x86_64 \
+      ${if vncDisplay != null then "-vnc ${vncDisplay}" else "-nographic"} \
+      -accel kvm \
+      -m ${toString memSize} \
+      -smp ${toString smp} \
+      -cpu host \
+      -machine type=q35 \
+      -drive if=pflash,format=raw,readonly=on,file=${pkgs.OVMF.fd}/FV/OVMF_CODE.fd \
+      -drive if=pflash,format=raw,file=vars.fd \
+      -rtc base=localtime,clock=host \
+      -device qemu-xhci -device usb-tablet \
+      -global ICH9-LMB.disable_s3=1 -global ICH9-LMB.disable_s4=1 \
+      -drive file=disk.qcow2,format=qcow2,if=virtio \
+      -drive file=${iso},media=cdrom,readonly=on \
+      -drive file=${drivers.virtio-iso},media=cdrom,readonly=on \
+      -nic user,model=virtio-net-pci
+
+    echo "=== Windows install complete (Audit Mode image) ==="
+    mv disk.qcow2 $out
+  '';
+in drv // { _vmixOsType = "windows"; }