iso: fix packages.x86_64 (no inline comments; gstreamer-vaapi -> gst-plugin-va)

Inline comments after a package name broke kitty/flatpak (became invalid
names with trailing whitespace). gstreamer-vaapi was removed from Arch.
calamares is AUR-only -> commented pending a [tanin] rebuild decision.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

iso/build-profile/airootfs/etc/calamares/modules/mount.conf

@@ -0,0 +1,37 @@
+---
+# Snapper-friendly Btrfs subvolume layout (@ root + @snapshots at /.snapshots).
+extraMounts:
+- device: proc
+  fs: proc
+  mountPoint: /proc
+- device: sys
+  fs: sysfs
+  mountPoint: /sys
+- device: /dev
+  mountPoint: /dev
+  options: bind
+- device: tmpfs
+  fs: tmpfs
+  mountPoint: /run
+- device: /run/udev
+  mountPoint: /run/udev
+  options: bind
+
+mountOptions:
+- mountPoint: /
+  options: defaults,noatime
+- mountPoint: "*"
+  filesystem: btrfs
+  options: defaults,noatime,compress=zstd
+
+btrfsSubvolumes:
+- mountPoint: /
+  subvolume: /@
+- mountPoint: /home
+  subvolume: /@home
+- mountPoint: /var/cache
+  subvolume: /@cache
+- mountPoint: /var/log
+  subvolume: /@log
+- mountPoint: /.snapshots
+  subvolume: /@snapshots