feat(pipeline): add data pipeline workspace and extraction stage
- rename scripts/ to data-pipeline/, archive existing scripts
- add @lila/pipeline as pnpm workspace package
- add stage-1-extract through stage-5-compare folder structure
- update SUPPORTED_LANGUAGE_CODES (add es, de, fr)
- update SUPPORTED_POS (add adjective, adverb)
- add description field to term_glosses
- add term_examples table
- run and verify db migration
- write and verify extract.py (117,659 synsets across 5 languages)
- write PIPELINE.md
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