Normalize formatting/line endings across configs, controllers, models, tests, and OpenAPI specs.
Update rule expression/rule engine implementation and remove obsolete RuleAction controller/model.
Add unit tests for rule expression syntax and multi-action behavior, and include docs updates.
- Create App\Traits\ResponseTrait that wraps CodeIgniter\API\ResponseTrait
- Add json_helper with convert_empty_strings_to_null() and prepare_json_response() functions
- Replace all imports of CodeIgniter\API\ResponseTrait with App\Traits\ResponseTrait across all controllers
- Add 'json' helper to BaseController helpers array
- Ensure consistent API response formatting across the application
