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.
- Add /api/rules CRUD, nested actions, and expr validation
- Add rules migration, models, and RuleEngine/Expression services
- Run ORDER_CREATED rules after order create (non-blocking) and refresh tests
- Update OpenAPI tags/schemas/paths and bundled docs
