[0.11.0] [Cherry-pick #4058] Fixes Qwen3-Next enable nz accuracy problem (#4056)

### What this PR does / why we need it?
- Fixes Qwen3-Next enable nz accuracy problem

---------

Signed-off-by: wxsIcey <1790571317@qq.com>
Signed-off-by: Icey <1790571317@qq.com>

tests/ut/worker/test_worker_v1.py

@@ -19,7 +19,13 @@ class TestNPUWorker(TestBase):
         self.model_config_mock = MagicMock(spec=ModelConfig)
         self.model_config_mock.dtype = torch.float16
         self.model_config_mock.trust_remote_code = False
-        self.model_config_mock.hf_config = None
+
+        self.hf_config_mock = MagicMock()
+        self.hf_config_mock.model_type = "test_model"
+        if hasattr(self.hf_config_mock, 'index_topk'):
+            delattr(self.hf_config_mock, 'index_topk')
+
+        self.model_config_mock.hf_config = self.hf_config_mock
 
         self.parallel_config_mock = MagicMock(spec=ParallelConfig)
 
@@ -245,6 +251,7 @@ class TestNPUWorker(TestBase):
 
             self.assertIn("Sleep mode is not enabled", str(cm.exception))
 
+    @patch('vllm_ascend.utils._ENABLE_NZ', False)
     @patch("vllm_ascend.worker.worker_v1.sleep_mode_enabled")
     @patch("vllm_ascend.worker.worker_v1.CaMemAllocator")
     @patch.dict(os.environ, {"VLLM_ASCEND_ENABLE_NZ": "0"})