laptop image tiers, devshell, partition preserve, cleanup

Images:
- laptopUpstream: bare OS install with AHCI, no templates
- laptopSlim: essentials only (debloat, registry tweaks)
- laptop: full (essentials + all apps)
- win10/win11 images use rec for self-references

CLI:
- preserve recovery partition (4) during disk copy
- expand partition 3 up to partition 4 boundary
- remove VNC CLI flag (use vncDisplay in nix configs instead)

Flake:
- add devShell with vmix alias and PS1 prompt

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

cli.nix

@@ -224,7 +224,7 @@ pkgs.writeShellScriptBin "vmix" ''
     ${pkgs.gptfdisk}/bin/sgdisk -d 4 "$TO_DISK" 2>/dev/null || true
 
     echo "[4/5] Expanding Windows partition (partition 3)..."
-    ${pkgs.parted}/bin/parted -s "$TO_DISK" resizepart 3 100%
+      ${pkgs.parted}/bin/parted -s "$TO_DISK" resizepart 3 100%
 
     if [[ "$TO_DISK" == *nvme* ]] || [[ "$TO_DISK" == *mmcblk* ]]; then
       WIN_PART="''${TO_DISK}p3"