Remove unused Clone derive from TxFeeInfo

[Copilot]

The Clone derive on TxFeeInfo was added to support passing cloned fee info to BacklogStats::from_feeinfo_slice, but the implementation uses &[&TxFeeInfo] instead—no cloning occurs.

Changes:

• Removed #[derive(Clone)] from TxFeeInfo struct in src/util/fees.rs

The struct fields (u64, u64, f64) are small enough that cloning would be cheap if needed, but since references are passed throughout the codebase, the derive is unnecessary.

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