feat: migrate production schema from OMW to Kaikki flat vocabulary model

- 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

packages/db/drizzle/meta/_journal.json

@@ -78,6 +78,13 @@
       "when": 1776929932845,
       "tag": "0010_thankful_reaper",
       "breakpoints": true
+    },
+    {
+      "idx": 11,
+      "version": "7",
+      "when": 1777994750330,
+      "tag": "0011_nice_spyke",
+      "breakpoints": true
     }
   ]
 }