[PD-Disagg] Unify prefill info data transition flow, all with PrefillServerInfo#19195

hnyls2002 merged 5 commits intomainsgl-project/sglang:mainfrom

lsyin/introduce-prefill-info-dataclasssgl-project/sglang:lsyin/introduce-prefill-info-dataclassCopy head branch name to clipboard