Padroniza cross_modal_validation/ em Parquet (remove duplicatas CSV)

Rewrite configured parquet files with pyarrow

Fix dataset viewer: rewrite notes_pt.parquet with explicit string/Int64 dtypes (drop pandas_type=mixed that broke parquet-rs)

Update README.md

datacard: full author name (Davi Machado da Rocha)

datacard: remove non-canonical task category tag

v1.0: notes_pt, entities, metadata, taxonomy, cross_modal_validation, datacard

initial commit