- Add ALLOWED_ORIGINS env var with comma-separated origin list
- Validate origins at startup in production: reject wildcards, empty values,
and malformed URLs (non-http/https protocol)
- Update both server entry points (server.ts, index.ts) to use getCorsOrigins()
- Development mode retains existing localhost fallback behavior
Co-Authored-By: Paperclip <noreply@paperclip.ing>