Fix routed experts capture for hybrid models (Mamba + Attention) (#35744)

Signed-off-by: arlenxu <arlenxu@tencent.com>
Signed-off-by: xhx1022 <1737006628@qq.com>
Co-authored-by: arlenxu <arlenxu@tencent.com>

vllm/v1/worker/gpu_worker.py

@@ -552,6 +552,9 @@ class Worker(WorkerBase):
         else:
             self.model_runner.initialize_kv_cache(kv_cache_config)
 
+        if self.model_config.enable_return_routed_experts:
+            self.model_runner.init_routed_experts_capturer()
+
         # Build KV-zero metadata outside the CuMem pool so the bookkeeping
         # GPU tensors (seg_addrs, block-id buffers) use the standard PyTorch
         # allocator and are not discarded during sleep/wake cycles.