[Model] Support Nemotron 3.5 Lightning speculative decoding (#36186)

Co-authored-by: Ryan Stewart <rystewart@nvidia.com>

python/sglang/srt/model_executor/model_runner.py

@@ -807,6 +807,15 @@ class ModelRunner:
     ) -> int:
         """Logits rows per decode batch slot."""
         if self.spec_algorithm.is_speculative():
+            if self.spec_algorithm.is_dspark() and self.is_draft_worker:
+                from sglang.srt.speculative.dspark_components.dspark_config import (
+                    get_dspark_sample_from_anchor,
+                )
+
+                if not get_dspark_sample_from_anchor(self.model_config.hf_config):
+                    if num_draft_tokens is None:
+                        num_draft_tokens = get_spec().speculative_num_draft_tokens
+                    return int(num_draft_tokens)
             return resolve_num_tokens_per_req(
                 phase="target_verify",
                 spec_algorithm=self.spec_algorithm,