b11776

server: Support logprobs with speculative decoding (#27196)

• return logprobs in spec path

• server: add regression test for logprobs with speculative decoding

Asserts accepted draft tokens report the target model's logprobs,
comparing a draft-enabled run against a no-draft baseline (#24271).
Fails on master (top_logprobs empty, logprob 0.0), passes with the
fix from #27196.

Co-Authored-By: Claude Fable 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01KARBWpPcijcBXzJEvttuwk

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Co-authored-by: Jeonghyun Lee sig.jhl@gmail.com
Co-authored-by: Claude Fable 5 noreply@anthropic.com

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