docs: record minted dataset DOI

#3
Owner

Correct stale pre-mint statements after DOI 10.57967/hf/10345 was registered. Record the DOI-registered revision, update citation files, and disclose the verified 122/8/2 synthetic split distribution. Documentation only; no audio, metadata, Parquet, or shard changes.

Owner

Verified exact PR head 20247d8be7913665185b69ada1defbe2922a0047 against the local four-file documentation payload. Merging DOI/citation correction only; no data files changed.

Atika88 changed pull request status to merged

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