- Replace terms/translations/term_glosses/term_examples with vocabulary_entries
and entry_translations
- Remove decks, topics and related tables (deferred)
- Add cefr_level and difficulty to entry_translations for game query filtering
- Update termModel.ts for new schema — getDistractors now takes sourceLanguage
- Update gameService.ts and multiplayerGameService.ts for entryId rename
- Update all test fixtures from termId to entryId
- Generate and apply migration 0011
