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 web server routes and UI buttons for initiating Spotify and Tidal OAuth authentication flows, with dedicated callback servers for token exchange. Updates Docker ports for OAuth callbacks and refines PKCE handling for Tidal. Improves user experience by allowing authentication directly from the web UI.
Introduces Docker deployment files (.dockerignore, Dockerfile, docker-compose.yml, docker-setup.sh, requirements-webui.txt, and README-Docker.md) for SoulSync WebUI. Refactors core/database_update_worker.py and core/media_scan_manager.py to support headless operation without PyQt6, enabling signal/callback compatibility for both GUI and non-GUI environments. Removes logs/app.log file.
