fix(site-api): rustfmt leaderboard pin-only assertion

[echobt]

Summary

• cargo fmt --check failed on main after fix(site-api): Prism leaderboard ranks only v2.1 #179 (handlers.rs leaderboard assertion).
• Required so CI can go green and prod can promote.

Test plan

• cargo fmt --all -- --check

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⚙️ Run configuration

Configuration used: defaults

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Run ID: 33641c88-f7ec-4047-aee6-e7e290488705

📥 Commits

Reviewing files that changed from the base of the PR and between 110b471 and f3aceb1.

📒 Files selected for processing (1)

• crates/site-api/src/handlers.rs

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