feat: add Dutch descending-price auction mode for faster default liquidation recovery#427
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- Add AuctionMode enum (English/Dutch) to types.rs - Extend AuctionConfig with Dutch auction parameters (dutch_start_price, dutch_floor_price) - Implement compute_dutch_price function for overflow-safe monotone decreasing price calculation - Update init_auction to accept mode and Dutch parameters - Update place_bid to support Dutch auction first-bid settlement - Add comprehensive Dutch auction tests covering price at start, mid, and floor - Update existing tests to use new init_auction signature - Fix duplicate members in Cargo.toml Generated with Devin https://cli.devin.ai/docs Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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Add Dutch auction mode for faster default liquidation recovery with overflow-safe monotone decreasing price calculation. Changes include AuctionMode enum, Dutch auction parameters in AuctionConfig, compute_dutch_price function, and comprehensive tests.