Check Domain

Check if a domain is available for purchase and get its price. Always call this before buy_domain. Show the user the price_display value (e.g. "$18.12") and confirm they want to proceed before buying. Args: domain: The full domain name to check (e.g. "coolstartup.com"). Returns: Dict with availability status, price in cents, and formatted price. If available, includes price_cents and price_display for the 1-year registration cost.