Add field info help text

[karilint]

Closes #191

Summary

• add a shared field-info catalog seeded from the DwC-A taxa measurementMethod descriptions
• show a help icon beside detail-table labels when the adjacent field has info text
• reuse the same catalog for DwC-A species measurementMethod output

Validation

• npx jest src/tests/components/DetailView/TabLayoutFieldInfo.test.tsx --runInBand
• npx jest src/unit-tests/dwcArchiveExport.test.ts --runInBand
• npm run tsc:frontend
• npm run tsc:backend
• npm run lint:frontend
• npm run lint:backend
• git diff --check
• commit hook: npm run lint && npm run tsc