{"service":"LinkFile","description":"Remote download proxy. Submit a URL; the server fetches it and streams the file back.","endpoints":{"GET /download?url=<url>&filename=<name>":"Fetch and stream a file","POST /download":"JSON body {\"url\": \"...\", \"filename\": \"...\"}","GET /health":"Health check"},"notes":"Only public http/https targets are allowed; internal/private addresses are blocked."}