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

packages/db/src/data/wordlists/top1000englishnouns-missing

@@ -0,0 +1,34 @@
+a
+other
+us
+may
+st
+paul
+new
+software
+oxford
+english
+mary
+japan
+while
+pp
+membership
+manchester
+tony
+alan
+jones
+un
+northern
+simon
+behalf
+co
+graham
+joe
+guy
+lewis
+jane
+taylor
+co-operation
+travel
+self
+thatcher