fix(os): align mkosi guest identity and tooling

[kvinwang]

Summary

• write dstack-owned release metadata into mkosi guest images while retaining Debian compatibility through ID_LIKE=debian
• use the Debian trixie codename for mkosi and preserve Yocto own codename
• use lowercase dstack naming in both image backends
• add the requested network diagnostics, downloader, disk utilities, hardware inspection tools, and cpio to mkosi runtime images
• add static acceptance coverage for release metadata and the required runtime packages

Added mkosi commands

• ping, ping6, nslookup, traceroute, nc
• wget
• fdisk, sfdisk, cfdisk, mkfs.vfat
• lspci, lsusb
• cpio

Validation

• bash os/mkosi/tests/acceptance.sh
• pre-commit hooks
• git diff --check

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