[Deepseek V3.2] Only skip Indexer logits computation when is_extend_without_speculative (#12816)

Signed-off-by: Hao Lu <14827759+hlu1@users.noreply.github.com>

python/sglang/srt/model_executor/forward_batch_info.py

@@ -141,6 +141,13 @@ class ForwardMode(IntEnum):
     def is_split_prefill(self):
         return self == ForwardMode.SPLIT_PREFILL
 
+    def is_extend_without_speculative(self):
+        return (
+            self.is_extend()
+            and not self.is_target_verify()
+            and not self.is_draft_extend()
+        )
+
 
 @total_ordering
 class CaptureHiddenMode(IntEnum):