[codex] Add species taxonomy suggestions

[karilint]

Summary

• adds free-text autocomplete suggestions for species taxonomy fields in the Species taxonomy tab
• reuses the existing species list query already loaded by the taxonomy tab
• keeps saved values as plain text, so users can still enter new taxonomy values
• adds a focused test for taxonomy suggestion option generation

Root cause

The React species taxonomy form used plain text fields, so users had no guidance from existing taxonomy values while entering orders, families, genera, species names, and related classification fields.

Validation

• npx jest src/tests/components/SpeciesTaxonomySuggestions.test.ts --runInBand
• npm run lint:frontend
• npm run tsc:frontend
• commit hook also ran npm run lint and npm run tsc

Fixes #838