Fix dataset card: reindex instead of join=inner, rename seizure-detection -> seizure-prediction, fix task description to forecasting

Fix dataset card: correct label definitions, NaN/Inf note, montage gaps, evaluation warning, reference LOPO result

Fix license: odc-by, correct 22 subjects/24 cases, remove ownership claims, fix 590+ → 590

Fix license: odc-by, correct 22 subjects/24 cases, remove ownership claims, fix 590+ → 590

README v3: professional dataset card with validated per-subject statistics, precise pipeline parameters, and comprehensive documentation

Update README: comprehensive feature docs and download guide

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initial commit