feat(marketplace): implement auction results calculation logic

[DeVikingMark]

This PR:

• Implements auction results calculation logic in marketplace solver
• Adds validation for reserve prices in auction bids
• Adds handling of inactive rollups in auction process
• Adds comprehensive test suite for auction functionality

This PR does not:

• Implement shared solver state with HotShot events (tracked in TODO comment, requires separate issue)

Key places to review:

• marketplace-solver/src/state.rs:
  • calculate_auction_results_permissionless function: Implementation of auction winner selection logic
  • calculate_auction_results_permissioned function: Reuse of permissionless logic with signature verification
• marketplace-solver/src/testing.rs:
  • New test cases for auction functionality:
    • test_calculate_auction_results_no_bids
    • test_calculate_auction_results_with_bids
    • test_calculate_auction_results_bid_below_reserve
    • test_calculate_auction_results_inactive_rollup

How to test this PR:

• Run tests: cargo test -p marketplace-solver
• All new tests are integrated with existing test infrastructure using MockSolver

Things tested

• Auction winner selection with various bid amounts
• Reserve price validation
• Inactive rollup handling
• Reserve URL fallback for namespaces without valid bids
• Integration with existing rollup registration system

• [x] Issue linked or PR description mentions why this change is necessary
• [x] PR description is clear enough for reviewers
• [x] Documentation for changes has been updated
• [x] All changes are covered by tests