[Core] Give the OpenAI Realtime wire codec a reusable home (RFC #6592 P0a) (#7640)

Signed-off-by: psv666 <2693925048@qq.com>

tools/pre_commit/check_forbidden_imports.py

@@ -79,11 +79,12 @@ CHECK_IMPORTS = {
             "vllm_omni/entrypoints/openai/video_stream_base.py",
             "vllm_omni/entrypoints/openai/video_stream_session.py",
             "vllm_omni/experimental/fullduplex/client.py",
-            "vllm_omni/engine/duplex/audio.py",
             "vllm_omni/engine/duplex/commands.py",
             "vllm_omni/engine/duplex/contracts.py",
-            "vllm_omni/engine/duplex/events.py",
-            "vllm_omni/engine/duplex/realtime_commands.py",
+            "vllm_omni/protocol/realtime/audio.py",
+            "vllm_omni/protocol/realtime/audio_input.py",
+            "vllm_omni/protocol/realtime/events.py",
+            "vllm_omni/protocol/realtime/items.py",
             "vllm_omni/experimental/fullduplex/joyvl/memory/memory.py",
             "vllm_omni/model_executor/models/minicpmo_4_5/duplex/input.py",
             "vllm_omni/model_executor/models/minicpmo_4_5/duplex/plugin.py",