- Added structured logs in HandleError() for each error type in middleware
- Explicit log of the OAuth callback error before handling
feat: add configurable log level via ACKIFY_LOG_LEVEL
- Add ParseLevel function to logger package
- Extend config structure with LoggerConfig
- Apply log level during server initialization
- Update documentation and .env.example
Add complete Go application for cryptographic document signature validation with OAuth2 authentication, Ed25519 signatures, and PostgreSQL storage following clean architecture principles.