Update OpenAPI UUID parameter types

[vaishnavidesai09]

Summary

This PR updates the OpenAPI parameter definitions for UUID path and query parameters to match the existing actix_web::web::Path<Uuid> implementation.

Changes

• Updated player endpoint path parameter documentation to use Uuid instead of String.
• Updated game endpoint path parameter documentation to use Uuid instead of String.
• Updated the player_id query parameter documentation to use Option<Uuid>.

Why

The API handlers already use Path<Uuid>, which automatically validates incoming UUIDs and returns a 400 Bad Request for malformed values. These changes keep the generated OpenAPI documentation consistent with the runtime behavior and clearly communicate that these parameters are UUIDs.

Testing

• Ran cargo fmt
• Ran cargo test -p api (all API tests passed)

Closes #894

[vaishnavidesai09]

Hey @chinweobtagaz kindly review this pr