Dataset card: frame rate 30 fps for all datasets

Dataset card: correct frame rates (EMDB/RICH/EgoBody 24 fps, 3DPW/SLOPER4D 30 fps)

Rewrite dataset card: YAML metadata, schema table, category counts, loading example

Correct EMDB downsample factor and frame rate note

Update dataset card for v6.3

MoveVQA v6.3: replace test_sloper4d.jsonl

MoveVQA v6.3: replace test_3dpw.jsonl

MoveVQA v6.3: replace test_egobody.jsonl

MoveVQA v6.3: replace test_rich.jsonl

MoveVQA v6.3: replace test_emdb.jsonl

MoveVQA v6.3: replace val.jsonl

MoveVQA v6.3: replace train.jsonl

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