[Core][Model] Enable Qwen3-TTS MRV2 and optimize the TTS pipeline (#7781)

Signed-off-by: Sy03 <1370724210@qq.com>

tests/engine/test_request_snapshot.py

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
+import copy
+
+import pytest
+
+from vllm_omni.engine.request_snapshot import copy_request_snapshot
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def test_full_snapshot_preserves_fields_aliases_and_isolation():
+    samples = [0.25, 0.5]
+    source = {"prompt_token_ids": [1, 2], "additional_information": {"samples": samples}, "alias": samples}
+    result = copy_request_snapshot(source)
+    assert result == copy.deepcopy(source)
+    assert result["alias"] is result["additional_information"]["samples"]
+    result["alias"].append(0.75)
+    result["prompt_token_ids"][0] = 9
+    assert samples == [0.25, 0.5]
+    assert source["prompt_token_ids"] == [1, 2]