feat: add service status monitoring to dashboard with parallel health checks for 14 services

Add SERVICE_DEFINITIONS list with Radarr, Sonarr, SABnzbd, Jellyfin, Seerr, Prowlarr, Easynews as Indexer, qBittorrent, Bazarr, Lingarr, LibreTranslate, Sonarr-Prowlarr Proxy, Radarr-Prowlarr Proxy, and Dashboard. Add check_service() to perform HTTP/API health checks with configurable timeout. Add refresh_services() to run checks in parallel using service_check_executor ThreadPoolExecutor with 16 workers.

docker-compose.yml

@@ -5,6 +5,8 @@ services:
     restart: unless-stopped
     ports:
       - "8099:8099"
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     env_file:
       - .env
     volumes: