Revert "fix(build): use pct mount to fix Debian 13 root ownership"

This reverts commit 6267250e49.

misc/build.func

@@ -3879,21 +3879,14 @@ EOF
   fix_gpu_gids
 
   # Fix Debian 13 LXC template bug where / is owned by nobody:nogroup
-  # This causes systemd-tmpfiles to fail with "unsafe path transition" errors
-  # We need to fix this from the host before any package installation
-  if [[ "$var_os" == "debian" && "$var_version" == "13" ]]; then
-    # Stop container, fix ownership, restart
-    pct stop "$CTID" >/dev/null 2>&1 || true
-    sleep 1
-    # Get the actual rootfs path from pct mount
-    local rootfs_path
-    rootfs_path=$(pct mount "$CTID" 2>/dev/null | grep -oP 'mounted at \K.*' || echo "")
-    if [[ -n "$rootfs_path" && -d "$rootfs_path" ]]; then
-      chown root:root "$rootfs_path" 2>/dev/null || true
+  # This must be done from the host as unprivileged containers cannot chown /
+  local rootfs
+  rootfs=$(pct config "$CTID" | grep -E '^rootfs:' | sed 's/rootfs: //' | cut -d',' -f1)
+  if [[ -n "$rootfs" ]]; then
+    local mount_point="/var/lib/lxc/${CTID}/rootfs"
+    if [[ -d "$mount_point" ]] && [[ "$(stat -c '%U' "$mount_point")" != "root" ]]; then
+      chown root:root "$mount_point" 2>/dev/null || true
     fi
-    pct unmount "$CTID" >/dev/null 2>&1 || true
-    pct start "$CTID" >/dev/null 2>&1
-    sleep 3
   fi
 
   # Continue with standard container setup