feat: add data partition creation with ROM directory structure

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/mkdata.sh

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+#!/bin/bash
+# Create the data partition image with ROM directory structure.
+set -e
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+image="$1"
+
+if [ -z "$image" ]; then
+    echo "Usage: $0 IMAGE"
+    exit 1
+fi
+
+# Build guestfish commands to create exFAT filesystem with ROM dirs
+script=(
+    "run"
+    "mkfs vfat /dev/sda label:ROMS"
+    "mount /dev/sda /"
+)
+
+# Create ROM directories
+while IFS= read -r dir; do
+    [ -z "$dir" ] && continue
+    [[ "$dir" =~ ^# ]] && continue
+    script+=("mkdir \"/roms/$dir\"")
+done < "$script_dir/rom-dirs.txt"
+
+# Create support directories
+script+=("mkdir \"/roms/bios\"")
+script+=("mkdir \"/roms/saves\"")
+script+=("mkdir \"/roms/screenshots\"")
+
+for cmd in "${script[@]}"; do
+    echo "$cmd"
+done | guestfish --format=raw -a "$image"
+
+echo "Data partition image created at $image"

scripts/rom-dirs.txt

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+3do
+amiga
+amigacd32
+amstradcpc
+amstradgx4000
+arcade
+astrocde
+atari2600
+atari5200
+atari7800
+atari800
+atarijaguar
+atarilynx
+atarist
+atarixegs
+atomiswave
+c128
+c16
+c64
+channelf
+coleco
+daphne
+doom
+dos
+dreamcast
+easyrpg
+famicom
+fbneo
+fds
+gamegear
+gb
+gba
+gbc
+genesis
+intellivision
+lowresnx
+mame
+mastersystem
+megadrive
+megaduck
+msx
+msx2
+n64
+naomi
+nds
+neogeo
+neogeocd
+nes
+ngp
+ngpc
+odyssey2
+openbor
+pc
+pc98
+pcengine
+pcenginecd
+pcfx
+pico8
+pokemini
+ports
+psp
+psx
+satellaview
+saturn
+scummvm
+sega32x
+segacd
+sfc
+sg1000
+snes
+sufami
+supergrafx
+supervision
+tg16
+tg16cd
+tic80
+uzebox
+vectrex
+vic20
+videopac
+virtualboy
+wonderswan
+wonderswancolor
+wolf3d
+x1
+x68000
+zx81
+zxspectrum