Updated Soulseek client, web server, and docker-compose.yml to better handle service URLs when running inside Docker containers. Localhost URLs are now resolved to host.docker.internal, and Docker-specific volume mounts and extra_hosts are configured for improved interoperability between container and host services.
Introduces a global activity feed system with API endpoints for recent activities and toasts, and integrates activity tracking for key backend events (downloads, syncs, database updates, etc.). Updates the dashboard frontend to periodically fetch and display activity feed items and show toasts for recent actions. Improves error logging and reduces noise for expected 404s in Soulseek client. Adds related CSS for activity feed separators.
