fix: use environment variables for HOST/PORT instead of CLI args

SvelteKit's Node adapter reads HOST and PORT from environment variables,
not command line arguments. This was causing the server to not bind
to the correct port, failing the HuggingFace Spaces healthcheck.

entrypoint.sh

@@ -15,5 +15,7 @@ if [ "$INCLUDE_DB" = "true" ] ; then
 fi;
 
 export PUBLIC_VERSION=$(node -p "require('./package.json').version")
+export HOST=0.0.0.0
+export PORT=3000
 
-dotenv -e /app/.env -c -- node --dns-result-order=ipv4first /app/build/index.js -- --host 0.0.0.0 --port 3000
+dotenv -e /app/.env -c -- node --dns-result-order=ipv4first /app/build/index.js