feat(db): complete deck generation script for top english nouns

- add deck_terms to schema imports
- add addTermsToDeck — diffs source term IDs against existing deck_terms,
  inserts only new ones, returns count of inserted terms
- add updateValidatedLanguages — recalculates and persists validated_languages
  on every run so coverage stays accurate as translation data grows
- wire both functions into main with isNewDeck guard to avoid redundant
  validated_languages update on deck creation
- add final summary report
- fix possible undefined on result[0] in createDeck
- tick off remaining roadmap items

documentation/notes.md

@@ -4,8 +4,6 @@
 
 - pinning dependencies in package.json files
 - rethink organisation of datafiles and wordlists
-- add this to drizzle migrations file:
-  ✅ ALTER TABLE terms ADD CHECK (pos IN ('noun', 'verb', 'adjective', etc));
 
 ## openwordnet