fix: guard device_get with hasattr check for already-converted lists

next_token_ids may already be a Python list (e.g. from overlap path
or spec decoding). Check for .device attribute before calling
jax.device_get().

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: JamesBrianD

python/sgl_jax/srt/managers/scheduler_output_processor_mixin.py

@@ -77,7 +77,8 @@ def process_batch_result_prefill(
             logits_output = self._gather_logits_output(logits_output)
 
             # Move next_token_ids to cpu as Python ints
-            next_token_ids = jax.device_get(next_token_ids).tolist()
+            if hasattr(next_token_ids, "device"):
+                next_token_ids = jax.device_get(next_token_ids).tolist()
 
             # Move next_token_ids and logprobs to cpu
             if batch.return_output_logprob_only and logits_output.next_token_logprobs is not None:
@@ -312,7 +313,8 @@ def process_batch_result_decode(
             logits_output = self._gather_logits_output(logits_output)
 
             # Move next_token_ids to cpu as Python ints
-            next_token_ids = jax.device_get(next_token_ids).tolist()
+            if hasattr(next_token_ids, "device"):
+                next_token_ids = jax.device_get(next_token_ids).tolist()
 
             # spec decoding handles output logprobs inside verify process.
             if batch.return_logprob or batch.return_output_logprob_only: