Initial release of ArvanCloud Logs datasource for Grafana.

- Query logs from ArvanCloud CloudLog spaces
- Visual filter builder for easy log filtering
- Support for text search and field-based filters
- Log volume histogram showing log distribution over time
- Pagination support (100 logs per request)
- Auto-complete for field names
- Multiple severity levels (DEBUG, INFO, WARNING, ERROR, CRITICAL)
- Time range filtering

- Backend written in Go with support for all major platforms (Linux, macOS, Windows)
- Frontend built with React and Grafana UI components