Return deadline block in the solver competition V2 API

[squadgazzz]

Description

Adds the auction deadline block to the solver competition V2 API as requested in #3947:

It would be very useful to add the /settle deadline in the competition endpoint, as this would allow everyone to easily compute rewards based on the transaction hashes already included there (and the corresponding blocks txs took place) and the deadline of the /settle call.

This would also allow to easily extend the circuit breaker functionality to blacklist a solver that executes after the deadline.

How to test

Adjusted existing tests.

Related Issues

Fixes #3947

[github-actions]

Reminder: Please consider backward compatibility when modifying the API specification.
If breaking changes are unavoidable, ensure:

• You explicitly pointed out breaking changes.
• You communicate the changes to affected teams (at least Frontend team and SAFE team).
• You provide proper versioning and migration mechanisms.

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Caused by:

• crates/orderbook/openapi.yml

[Copilot]

Pull request overview

This PR adds the auction deadline block to the solver competition V2 API response, enabling easier computation of solver rewards and extending circuit breaker functionality to detect solvers executing after the deadline.

• Exposes the existing deadline field from the database through all API layers
• Updates the API response structure and OpenAPI documentation with the new field
• Adds appropriate test coverage for the new field

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
crates/database/src/solver_competition_v2.rs	Added deadline field to Auction struct and updated SQL query to fetch it from competition_auctions table
crates/orderbook/src/database/solver_competition_v2.rs	Mapped auction.deadline from database to auction_deadline_block in API response
crates/model/src/solver_competition_v2.rs	Added auction_deadline_block field to Response struct with proper serialization and updated tests
crates/orderbook/openapi.yml	Documented the new auctionDeadlineBlock field in the API specification

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