Auto-reboot after imaging, auto-download pip-wheels in build scripts

startnet.cmd now polls for PESetup.exe completion and reboots with a
15-second countdown. Build scripts (USB + Proxmox) auto-download pip
wheels if the pip-wheels/ directory is missing. Added mok-keys/ to
gitignore.

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

build-proxmox-iso.sh

@@ -232,11 +232,20 @@ if [ -d "$WEBAPP_DIR" ]; then
 fi
 
 # Python wheels
+if [ ! -d "$PIP_WHEELS_DIR" ]; then
+    echo "    pip-wheels/ not found — downloading now..."
+    mkdir -p "$PIP_WHEELS_DIR"
+    if pip3 download -d "$PIP_WHEELS_DIR" flask lxml 2>/dev/null; then
+        echo "    Downloaded pip wheels successfully."
+    else
+        echo "    WARNING: Failed to download pip wheels (no internet?)"
+        rmdir "$PIP_WHEELS_DIR" 2>/dev/null || true
+    fi
+fi
 if [ -d "$PIP_WHEELS_DIR" ]; then
     cp -r "$PIP_WHEELS_DIR" "$PXE_DATA/pip-wheels"
-    echo "    Copied pip-wheels/"
-else
-    echo "    WARNING: No pip-wheels/ found (run download-packages.sh first)"
+    WHEEL_COUNT=$(find "$PIP_WHEELS_DIR" -name '*.whl' | wc -l)
+    echo "    Copied pip-wheels/ ($WHEEL_COUNT wheels)"
 fi
 
 # WinPE boot files (wimboot, boot.wim, BCD, ipxe.efi, etc.)