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/package.json

@@ -6,7 +6,9 @@
   "scripts": {
     "build": "tsc",
     "generate": "drizzle-kit generate",
-    "migrate": "drizzle-kit migrate"
+    "migrate": "drizzle-kit migrate",
+    "db:seed": "npx tsx src/seeding-datafiles.ts",
+    "db:build-deck": "npx tsx src/generating-deck.ts"
   },
   "dependencies": {
     "@glossa/shared": "workspace:*",