- Updated `domain_validator` to strip brackets from IPv6 addresses for proper normalization when `net.SplitHostPort` fails.
- Marked the Admin API integration task in `progress.md` as complete.
- Added `entDomainValidator` implementation to validate `(domain, client_api_key)` combinations from the `Domain` table using `ent.Client`.
- Replaced dummy validator with the new ent-based validator in server initialization.
- Updated documentation and progress tracking for domain validation implementation.
- Ensured compatibility with `host` and `host:port` formats by normalizing domain strings during validation.
