OSV-2026-610 Memcpy-param-overlap in htx_replace_blk_value

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=504612570 Crash type: Memcpy-param-overlap Crash state: htxreplaceblkvalue httpreplaceheadervalue httpschemebasednormalize...