feat: resolve chromecast discovery conflict and add CI/CD workflow

- Update Zeroconf to unicast mode to resolve port 5353 conflict with avahi-daemon
- Make API and Streamlit ports configurable via environment variables (defaults: 8055, 8505)
- Add Gitea Actions workflow for automated Docker builds and registry pushes
- Refactor Chromecast discovery to use modern CastBrowser API

Dockerfile

@@ -20,8 +20,12 @@ RUN chmod +x start.sh
 # Create necessary directories
 RUN mkdir -p config/thumbnails videos
 
-# Expose ports (FastAPI: 8003, Streamlit: 8503)
-EXPOSE 8003 8503
+# Default ports
+ENV API_PORT=8055
+ENV STREAMLIT_PORT=8505
+
+# Expose ports
+EXPOSE 8055 8505
 
 # Set Environment Variables
 ENV CONFIG_DIR=/app/config