[issue]: add support for no partition table filesystems

Official FAQ

• I have checked the official FAQ.

Ventoy Version

1.1.17

What about latest release

Yes. I have tried the latest release, but the bug still exist.

Try alternative boot mode

Yes. I have tried them, but the bug still exist.

BIOS Mode

Legacy BIOS Mode

Partition Style

MBR

Disk Capacity

500gb

Disk Manufacturer

No response

Image file checksum (if applicable)

None

Image file download link (if applicable)

No response

What happened?

Mistakingly yesterday I discovered that in linux I formatted my hdd using mkfs.btrfs /dev/sdb instead of sdb1 which formatted the whole drive as raw partition without partition table, then i tried to boot iso files using browse function but the partition isn't discoverable at all, I know it isn't common to use partition without partition table but adding support for such will add to the universality of ventoy

Thank you!