Internal members of multi-file archives (zip/tar/7z/rar) are now hashed
individually (crc/md5/sha1) and stored in a new `archive_members` JSON
column on the archive's RomFile, alongside the existing composite hash
used for hash-database matching. Only the archive itself is surfaced as
a RomFile so full_path keeps pointing at a file that exists on disk,
which is the constraint that previously forced us to choose between
composite-only or broken downloads.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>