[Hardware][Ascend][Model] Support MOSS-TTS-Nano on Ascend A2 (#7192)

Signed-off-by: Big2Wheel <1404207590@qq.com>

tests/model_executor/models/moss_tts_nano/test_npu_compat.py

@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
+
+import pytest
+import torch
+
+from vllm_omni.model_executor.models.moss_tts_nano.modeling_moss_tts_nano import (
+    _configure_attention_implementation,
+    _validate_max_num_seqs,
+)
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def test_non_cuda_attention_uses_sdpa():
+    class FakeModel:
+        attention_implementation = None
+
+        def _set_attention_implementation(self, implementation):
+            self.attention_implementation = implementation
+
+    model = FakeModel()
+    _configure_attention_implementation(model, torch.device("cpu"))
+
+    assert model.attention_implementation == "sdpa"
+
+
+def test_moss_tts_nano_rejects_concurrent_active_sequences():
+    _validate_max_num_seqs(1)
+
+    with pytest.raises(ValueError, match="requires max_num_seqs=1"):
+        _validate_max_num_seqs(2)