Complete archiso profile for OrionOS ISO build

- iso/profile/profiledef.sh: archiso profile with BIOS+UEFI bootmodes
- iso/profile/packages.x86_64: full package list (X11, audio, OrionOS deps)
- iso/profile/pacman.conf: pacman config for archiso
- iso/profile/airootfs/: live overlay (xinitrc, hostname, skel)
- iso/docker/Dockerfile: builds OrionOS from source, installs into airootfs, runs mkarchiso

iso/profile/packages.x86_64

@@ -0,0 +1,72 @@
+# OrionOS live system packages
+
+# Base system
+base
+linux
+linux-firmware
+mkinitcpio
+
+# X11
+xorg-server
+xorg-xinit
+xorg-xrandr
+xorg-xsetroot
+xorg-xev
+
+# Fonts
+ttf-dejavu
+noto-fonts
+ttf-liberation
+
+# Dependencies for OrionOS components
+libx11
+libxft
+libxfixes
+libxext
+libpng
+dbus
+libpam
+fontconfig
+freetype2
+
+# Desktop utilities
+feh
+picom
+xterm
+libnotify
+
+# Audio
+alsa-utils
+pulseaudio
+
+# Brightness
+light
+
+# Media playback control
+playerctl
+
+# Arch tools
+pacman-contrib
+pkexec
+polkit
+
+# System tools
+bash
+coreutils
+util-linux
+procps-ng
+grep
+gawk
+sed
+tar
+gzip
+
+# Network
+networkmanager
+dhcpcd
+
+# Misc
+git
+vim
+less
+which