<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Enhanced sign-in error handling with specific messages for different
error types.
- Implemented IP-based restrictions for authentication and publishing
actions.
- **Bug Fixes**
- Updated the retrieval of user session information to improve
reliability.
- **Documentation**
- Updated usage instructions for `getServerSession` to reflect the new
authentication options.
- **Refactor**
- Replaced direct usage of `authOptions` with a new function
`getAuthOptions` to dynamically generate authentication options.
- Improved IP address extraction logic to handle various header formats.
- **Chores**
- Added a new `BannedIp` model to the database schema for managing
IP-based restrictions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
