Fix dataset card metadata and sync canonical v1.4 structure

Fix dataset card metadata and sync canonical v1.4 structure

Sync Hugging Face mirror to canonical v1.4 structure

Delete files README (1).md README (2).md README (3).md README (4).md README (5).md README (6).md with huggingface_hub

Add Hugging Face dataset card metadata

Restore v1.4 repository folder structure

Upload v1.4 data folders

Add v1.4 dataset card

initial commit