Add Zero-OS customization before CPIO creation

- Add initramfs_finalize_customization() function
- Remove root password for passwordless login (sed -i 's/^root:[^:]*:/root::/' /etc/passwd)
- Update /etc/motd and /etc/issue to Zero-OS branding instead of Alpine
- Called automatically before CPIO creation
- Fixes init script duplication issue (/init vs /sbin/init)
- Correct boot flow: /init → switch_root → /sbin/zinit init (no /sbin/init needed)

configs/init

@@ -12,11 +12,10 @@ target="/mnt/root"
 mkdir -p $target
 mount -t proc proc /proc
 mount -t sysfs sysfs /sys
-mount -t tmpfs tmpfs /mnt/root -o size=1536M
+mount -t tmpfs tmpfs /mnt/root -o size=1024M
 mount -t devtmpfs devtmpfs /dev
 
 echo "[+] building ram filesystem"
-target="/mnt/root"
 
 # Copy Alpine filesystem to tmpfs (same as original)
 echo "  copying /bin..."
@@ -102,6 +101,6 @@ fi
 
 echo "[+] switching root"
 echo "  exec switch_root /mnt/root /sbin/zinit init"
-exec switch_root /mnt/root /sbin/zinit init
+exec switch_root /mnt/root /sbin/zinit -d init
 
 ##