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

app/main.py

@@ -2,13 +2,13 @@ import streamlit as st
 import httpx
 import time
 from pathlib import Path
-from utils import get_logger, get_host_ip
+from utils import get_logger, get_host_ip, API_PORT
 
 logger = get_logger(__name__)
 
 # Config - Use host IP so the browser can find the API
 HOST_IP = get_host_ip()
-API_URL = f"http://{HOST_IP}:8000"
+API_URL = f"http://{HOST_IP}:{API_PORT}"
 
 st.set_page_config(
     page_title="Boys Streaming 📺",