feat(extraction): scaffold extraction-service + @bytelyst/extraction package
- extraction-service: Fastify scaffold (port 4005) with extract/tasks modules
- src/lib/: config, errors, cosmos, product-config, python-bridge
- src/modules/extract/: types (Zod schemas), routes (POST /extract, batch, models)
- src/modules/tasks/: types, repository (Cosmos CRUD), routes (CRUD endpoints)
- Python sidecar: FastAPI app, LangExtract wrapper, models, task registry
- @bytelyst/extraction package: types, client factory, index exports
- Both pnpm build pass clean
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