feat(api): implement game terms query with double join

- Add double join on translations for source/target languages
- Left join term_glosses for optional source-language glosses
- Filter difficulty on target side only (intentionally asymmetric:
  a word's difficulty can differ between languages, and what matters
  is the difficulty of the word being learned)
- Return neutral field names (sourceText, targetText, sourceGloss)
  instead of quiz semantics; service layer maps to prompt/answer
- Tighten term_glosses unique constraint to (term_id, language_code)
  to prevent the left join from multiplying question rows
- Add TODO for ORDER BY RANDOM() scaling post-MVP

documentation/notes.md

@@ -5,6 +5,15 @@
 - pinning dependencies in package.json files
 - rethink organisation of datafiles and wordlists
 
+## notes
+
+- backend advice: https://github.com/MohdOwaisShah/backend
+- openapi
+- bruno for api testing
+- tailscale
+- husky/lint-staged
+- musicforprogramming.net
+
 ## openwordnet
 
 download libraries via
@@ -44,17 +53,3 @@ list all libraries:
 ```bash
 python -c "import wn; print(wn.lexicons())"
 ```
-
-## drizzle
-
-generate migration file, go to packages/db, then:
-
-```bash
-pnpm drizzle-kit generate
-```
-
-execute migration, go to packages/db (docker containers need to be running):
-
-```bash
-DATABASE_URL=postgresql://username:password@localhost:5432/database pnpm drizzle-kit migrate
-```