chore: remove unused std::vec import from split_structs #9020
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The split_structs optimization module was importing std::vec but never using the vec module directly (no vec::Vec, vec::IntoIter, etc.). Vec and the vec! macro come from the standard prelude in this workspace (Rust 2024 edition, no no_std or no_implicit_prelude), so this import was effectively dead code. Removing it cleans up the imports without changing behavior or semantics of the optimization.