stream_output_generation computed a full load snapshot on every
output flush: get_load() walks the waiting/bootstrap/prealloc queues
summing seqlens and builds a DpRequestInfoqOutput per queued request.
The only consumer is the DP load-balancer path in tokenizer_manager,
which forwards it iff dp_size > 1. Gate the computation on the same
condition; at dp_size == 1 the snapshot was computed and shipped for
nothing on every flush.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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