Add ESLint rule to validate translator key destructuring

Implements no-undefined-translator-keys rule that prevents destructuring
undefined keys from createTranslator objects. Validates both same-file and
cross-file imports using AST parsing and Node.js module resolution.

Author: claude

.pre-commit-config.yaml

@@ -29,7 +29,7 @@ repos:
         entry: yarn run lint-frontend:format
         language: system
         files: \.(js|vue|scss|css)$
-        exclude: ^kolibri/plugins/qti_viewer/assets/src/components/__fixtures__/items\.js
+        exclude: (?x)^(kolibri/plugins/qti_viewer/assets/src/components/__fixtures__/items\.js|packages/eslint-plugin-kolibri/tests/lib/rules/fixtures/malformed\.js)
 -   repo: local
     hooks:
     -   id: core-js-api