fix(evm): avoid extra copy in emit_log by in-place header prepend #3650
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Change emit_log to build the request buffer in-place by inserting the 4-byte topics header at the start of the existing Vec using reserve + copy_within. This removes the additional allocation and memcpy from creating a separate request buffer. It preserves the protocol (u32 topics followed by topic hashes and payload) and eliminates the TODO about removing the copy, reducing overhead on frequent log emissions.