* Add production-ready Polish localization and reusable locale audit tooling
- add and update Polish locale files across models, views, mailers, and shared translations
- add runtime rails-i18n dependency and Polish locale support in language helper
- add regression coverage for Polish pluralization and locale-aware money formatting
- introduce reusable locale audit script for any locale plus backward-compatible PL wrapper
- add localization audit docs and generated PL readiness/pluralization reports
- resolve one/few/many/other pluralization consistency for Polish locales
* Fix Polish locale review feedback
* Fix locale compatibility regressions
* Polish locale typo pass and wrapper cleanup
* Final language improvements and test isolation for Polish locales
- Improved partial_success wording in SnapTrade with proper noun inflection
- Fixed typos: Pomin → Pomiń in Mercury and LunchFlow items
- Isolated I18n backend state in polish_pluralization_test to prevent test coupling
* Fix code review comments in locale audit scripts
- Use RbConfig.ruby instead of 'ruby' to ensure consistent interpreter
- Remove Symbol from permitted_classes and explicitly allow CLDR plural symbols (one, few, many, other) in YAML loading
* Simplify i18n flow and align locale interpolation keys
* Remove locale audit scripts and localization docs
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