Cast topic_number/demuc_number/number to int64; prefix article_anchor with '#' (fix HF dataset-server statistics 500)

Treemap v4: recursive Other container shows all 22 small topics, left-aligned container header, balanced cell widths

Treemap v3: post-render shrink-fit guarantees no label overflow

Fix treemap: per-cell width-aware labels (no more text spilling between cells) + tighter canvas layout

Bilingual VI/EN ontology + cleaner visualisations + fixed BibTeX

Add bilingual ontology section + visualisations (treemap, sunburst, top-20 bars, mermaid mindmap)