Update project structure to use a src/ directory layout and
improve documentation across multiple files.
- Update README.md build command to use ./src
- Add directory structure documentation
- Update status endpoint to include DB health status
- Add pagination support (limit/offset) to whitelist list endpoints
- Document new query parameters with examples
- Update deployment guide to mark API token as required
- Add testing instructions
- Clarify audit log rotation in design documentation
8d25bda386