Add conversation history management and API endpoints

- Introduce new database models for conversation sessions, messages, and artifacts to support conversation history tracking.
- Implement API routes for listing conversations and retrieving detailed conversation data, enhancing user interaction with historical records.
- Add a conversation recorder service to persist conversation messages in real-time without disrupting ongoing calls.
- Update the frontend to display conversation history, including filtering and sorting options, improving user experience.
- Enhance the pipeline to integrate conversation history recording seamlessly during interactions.

backend/routes/voice_ws.py

@@ -24,13 +24,16 @@ from starlette.websockets import WebSocketDisconnect
 router = APIRouter()
 
 
-async def _resolve_start_config(raw: str) -> AssistantConfig:
+async def _resolve_start_config(raw: str) -> tuple[AssistantConfig, str | None]:
     data = json.loads(raw)
     if data.get("assistant_id"):
         async with SessionLocal() as session:
-            return await resolve_runtime_config(session, data["assistant_id"])
+            return (
+                await resolve_runtime_config(session, data["assistant_id"]),
+                data["assistant_id"],
+            )
     if data.get("inline_config"):
-        return AssistantConfig(**data["inline_config"])
+        return AssistantConfig(**data["inline_config"]), None
     raise ValueError("启动参数缺少 assistant_id 或 inline_config")
 
 
@@ -43,10 +46,10 @@ async def voice_stream(websocket: WebSocket):
         return
     await websocket.accept()
     try:
-        cfg = await _resolve_start_config(await websocket.receive_text())
+        cfg, assistant_id = await _resolve_start_config(await websocket.receive_text())
         transport = build_ws_transport(websocket)
         # 直接 await:管线持续读这条 WS 的音频帧,直到对端断开
-        await run_pipeline(transport, cfg)
+        await run_pipeline(transport, cfg, assistant_id=assistant_id, channel="websocket")
     except WebSocketDisconnect:
         logger.info("WS 音频流断开")
     except Exception as e: