Make setup ISO-only

Remove legacy online installer entrypoints, collapse migrations for 4.0, and move setup responsibilities into target-side system, hardware, and user commands.

install/hardware/vulkan.sh

@@ -0,0 +1,20 @@
+# Install Vulkan drivers matching detected GPU hardware
+# (NVIDIA Vulkan is handled by nvidia.sh via nvidia-utils)
+
+declare -A VULKAN_DRIVERS=(
+  [Intel]=vulkan-intel
+  [AMD]=vulkan-radeon
+  [Apple]=vulkan-asahi
+)
+
+PACKAGES=()
+
+for vendor in "${!VULKAN_DRIVERS[@]}"; do
+  if lspci | grep -iE "(VGA|Display).*$vendor" > /dev/null; then
+    PACKAGES+=("${VULKAN_DRIVERS[$vendor]}")
+  fi
+done
+
+if (( ${#PACKAGES[@]} > 0 )); then
+  omarchy-pkg-add "${PACKAGES[@]}"
+fi