- Implemented Redis-backed idempotency keys in SIM activation to prevent race conditions and double-charging.
- Increased bcrypt hashing rounds from 12 to 14 for stronger password security.
- Introduced a structured exception hierarchy to replace generic errors with domain-specific exceptions.
- Centralized Internet Access Mode constants and improved schema organization by extracting duplicated enum values.
- Updated various components to utilize new domain types for better consistency and maintainability.
- Enhanced error handling in SIM fulfillment and order activation processes to provide clearer feedback and prevent duplicate processing.
