Refactor project structure and enhance backend integration

- Expanded package inclusion in `pyproject.toml` to support new modules.
- Introduced new `adapters` and `protocol` packages for better organization.
- Added backend adapter implementations for control plane integration.
- Updated main application imports to reflect new package structure.
- Removed deprecated core components and adjusted documentation accordingly.
- Enhanced architecture documentation to clarify the new runtime and integration layers.

engine/tests/test_tool_call_flow.py

@@ -4,10 +4,10 @@ from typing import Any, Dict, List
 
 import pytest
 
-from core.conversation import ConversationState
-from core.duplex_pipeline import DuplexPipeline
-from models.ws_v1 import OutputAudioPlayedMessage, ToolCallResultsMessage, parse_client_message
-from services.base import LLMStreamEvent
+from runtime.conversation import ConversationState
+from runtime.pipeline.duplex import DuplexPipeline
+from protocol.ws_v1.schema import OutputAudioPlayedMessage, ToolCallResultsMessage, parse_client_message
+from providers.common.base import LLMStreamEvent
 
 
 class _DummySileroVAD:
@@ -86,9 +86,9 @@ class _CaptureGenerateLLM:
 
 
 def _build_pipeline(monkeypatch, llm_rounds: List[List[LLMStreamEvent]]) -> tuple[DuplexPipeline, List[Dict[str, Any]]]:
-    monkeypatch.setattr("core.duplex_pipeline.SileroVAD", _DummySileroVAD)
-    monkeypatch.setattr("core.duplex_pipeline.VADProcessor", _DummyVADProcessor)
-    monkeypatch.setattr("core.duplex_pipeline.EouDetector", _DummyEouDetector)
+    monkeypatch.setattr("runtime.pipeline.duplex.SileroVAD", _DummySileroVAD)
+    monkeypatch.setattr("runtime.pipeline.duplex.VADProcessor", _DummyVADProcessor)
+    monkeypatch.setattr("runtime.pipeline.duplex.EouDetector", _DummyEouDetector)
 
     pipeline = DuplexPipeline(
         transport=_FakeTransport(),
@@ -112,7 +112,7 @@ def _build_pipeline(monkeypatch, llm_rounds: List[List[LLMStreamEvent]]) -> tupl
 
 def test_pipeline_uses_default_tools_from_settings(monkeypatch):
     monkeypatch.setattr(
-        "core.duplex_pipeline.settings.tools",
+        "runtime.pipeline.duplex.settings.tools",
         [
             "current_time",
             "calculator",
@@ -141,7 +141,7 @@ def test_pipeline_uses_default_tools_from_settings(monkeypatch):
 
 
 def test_pipeline_exposes_unknown_string_tools_with_fallback_schema(monkeypatch):
-    monkeypatch.setattr("core.duplex_pipeline.settings.tools", ["custom_system_cmd"])
+    monkeypatch.setattr("runtime.pipeline.duplex.settings.tools", ["custom_system_cmd"])
     pipeline, _events = _build_pipeline(monkeypatch, [[LLMStreamEvent(type="done")]])
 
     schemas = pipeline._resolved_tool_schemas()
@@ -151,7 +151,7 @@ def test_pipeline_exposes_unknown_string_tools_with_fallback_schema(monkeypatch)
 
 
 def test_pipeline_assigns_default_client_executor_for_system_string_tools(monkeypatch):
-    monkeypatch.setattr("core.duplex_pipeline.settings.tools", ["increase_volume"])
+    monkeypatch.setattr("runtime.pipeline.duplex.settings.tools", ["increase_volume"])
     pipeline, _events = _build_pipeline(monkeypatch, [[LLMStreamEvent(type="done")]])
 
     tool_call = {
@@ -221,9 +221,9 @@ async def test_pipeline_applies_default_args_to_tool_call(monkeypatch):
 
 @pytest.mark.asyncio
 async def test_generated_opener_prompt_uses_system_prompt_only(monkeypatch):
-    monkeypatch.setattr("core.duplex_pipeline.SileroVAD", _DummySileroVAD)
-    monkeypatch.setattr("core.duplex_pipeline.VADProcessor", _DummyVADProcessor)
-    monkeypatch.setattr("core.duplex_pipeline.EouDetector", _DummyEouDetector)
+    monkeypatch.setattr("runtime.pipeline.duplex.SileroVAD", _DummySileroVAD)
+    monkeypatch.setattr("runtime.pipeline.duplex.VADProcessor", _DummyVADProcessor)
+    monkeypatch.setattr("runtime.pipeline.duplex.EouDetector", _DummyEouDetector)
 
     llm = _CaptureGenerateLLM("你好")
     pipeline = DuplexPipeline(
@@ -662,7 +662,7 @@ async def test_server_tool_timeout_emits_504_and_continues(monkeypatch):
             "status": {"code": 200, "message": "ok"},
         }
 
-    monkeypatch.setattr("core.duplex_pipeline.execute_server_tool", _slow_execute)
+    monkeypatch.setattr("runtime.pipeline.duplex.execute_server_tool", _slow_execute)
 
     pipeline, events = _build_pipeline(
         monkeypatch,