Changelog
- Add 6609 auction browse, action, query, mailbox list, content, and claim packet handlers
- Persist auction listings and mail while settling returns, purchases, winning bids, and escrow safely
- Project Silver vending booths into auction search and route auction purchases through mailbox delivery
- Charge native auction sellers a 5% commission and retain CP support behind a disabled switch
- Add database migrations, GreatMerchant access, player commands, and reverse-engineering documentation