gpu: nvidia install drops VFIO autoload; GPU flows self-repair stale vfio.conf

The nvidia driver installer now writes only `nvidia` and `nvidia_uvm` into `/etc/modules-load.d/nvidia-vfio.conf`, leaving the vfio-pci modules for `switch_gpu_mode.sh` to add and remove when the user explicitly transitions between LXC and VM mode. A host with residual `/etc/modprobe.d/vfio.conf` entries from an earlier VM passthrough setup no longer has vfio-pci racing nvidia at boot and capturing the GPU by ID.

All three GPU-facing entry points also detect a stale `vfio.conf` entry whose vid:did belongs to a GPU currently bound to a non-vfio driver, and offer to clean it in place. `nvidia_installer.sh` runs the check as a pre-flight before install. `switch_gpu_mode.sh` presents an interactive dialog and rebuilds initramfs. `switch_gpu_mode_direct.sh` performs the same cleanup transparently for the Monitor web variant. Once cleaned, "Add GPU to LXC", the driver install and Switch Mode all proceed without any manual intervention.

The two supporting helpers `_pci_driver_of` and `_clean_vfio_conf_ids` previously local to `add_gpu_lxc.sh` move to `scripts/global/pci_passthrough_helpers.sh`, so every GPU-related script resolves them from a single source without duplication.

scripts/gpu_tpu/nvidia_installer.sh

@@ -49,6 +49,11 @@ export COMPONENTS_STATUS_FILE
 if [[ -f "$UTILS_FILE" ]]; then
   source "$UTILS_FILE"
 fi
+if [[ -f "$LOCAL_SCRIPTS/global/pci_passthrough_helpers.sh" ]]; then
+  source "$LOCAL_SCRIPTS/global/pci_passthrough_helpers.sh"
+elif [[ -f "$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)/global/pci_passthrough_helpers.sh" ]]; then
+  source "$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)/global/pci_passthrough_helpers.sh"
+fi
 
 if [[ ! -f "$COMPONENTS_STATUS_FILE" ]]; then
   echo "{}" > "$COMPONENTS_STATUS_FILE"
@@ -124,6 +129,54 @@ check_gpu_not_in_vm_passthrough() {
   exit 0
 }
 
+check_stale_vfio_config_for_nvidia() {
+  local vfio_conf="/etc/modprobe.d/vfio.conf"
+  [[ ! -f "$vfio_conf" ]] && return 0
+
+  local ids_line ids_part
+  ids_line=$(grep "^options vfio-pci ids=" "$vfio_conf" 2>/dev/null | head -1)
+  [[ -z "$ids_line" ]] && return 0
+  ids_part=$(echo "$ids_line" | grep -oE 'ids=[^[:space:]]+' | sed 's/ids=//')
+  [[ -z "$ids_part" ]] && return 0
+
+  local dev vendor did vid_did
+  local -a legacy_ids=()
+  local legacy_list=""
+
+  for dev in /sys/bus/pci/devices/*; do
+    vendor=$(cat "$dev/vendor" 2>/dev/null)
+    [[ "$vendor" != "0x10de" ]] && continue
+    did=$(cat "$dev/device" 2>/dev/null)
+    [[ -z "$did" ]] && continue
+    vid_did="10de:${did#0x}"
+    if echo ",${ids_part}," | grep -q ",${vid_did},"; then
+      legacy_ids+=("$vid_did")
+      legacy_list+="  • $(basename "$dev")  [${vid_did}]\n"
+    fi
+  done
+
+  [[ ${#legacy_ids[@]} -eq 0 ]] && return 0
+
+  local msg
+  msg="\n$(translate 'A previous VFIO passthrough configuration was detected for the following NVIDIA GPU(s):')\n\n"
+  msg+="${legacy_list}\n"
+  msg+="$(translate 'The active kernel driver is not vfio-pci, but the entry in') /etc/modprobe.d/vfio.conf $(translate 'will rebind the GPU to vfio-pci on the next reboot, breaking the driver that is about to be installed.')\n\n"
+  msg+="\Z1\Zb$(translate 'Do you want to remove the stale entry from vfio.conf and continue?')\Zn"
+
+  dialog --colors --backtitle "ProxMenux" \
+    --title "$(translate 'Stale VFIO Config Detected')" \
+    --yesno "$msg" 18 78 || exit 0
+
+  if declare -F _clean_vfio_conf_ids >/dev/null 2>&1 \
+     && _clean_vfio_conf_ids "${legacy_ids[@]}"; then
+    msg_info "$(translate 'Rebuilding initramfs after vfio.conf cleanup...')"
+    update-initramfs -u >/dev/null 2>&1 || true
+    msg_ok "$(translate 'Stale VFIO entries removed and initramfs rebuilt.')" | tee -a "$screen_capture"
+  else
+    msg_ok "$(translate 'No changes were needed in vfio.conf.')" | tee -a "$screen_capture"
+  fi
+}
+
 detect_driver_status() {
   CURRENT_DRIVER_INSTALLED=false
   CURRENT_DRIVER_VERSION=""
@@ -531,12 +584,8 @@ EOF
 }
 
 ensure_modules_config() {
-  msg_info "$(translate 'Configuring NVIDIA and VFIO modules...')"
+  msg_info "$(translate 'Configuring NVIDIA modules...')"
   cat > /etc/modules-load.d/nvidia-vfio.conf <<'EOF'
-vfio
-vfio_iommu_type1
-vfio_pci
-vfio_virqfd
 nvidia
 nvidia_uvm
 EOF
@@ -1676,6 +1725,7 @@ main() {
   detect_nvidia_gpus
   detect_driver_status
   check_gpu_not_in_vm_passthrough
+  check_stale_vfio_config_for_nvidia
 
   if ! $NVIDIA_GPU_PRESENT; then
     dialog --backtitle "ProxMenux" --title "$(translate 'NVIDIA GPU Driver Installation')" --msgbox \