Try to fix confirm and interrupt

backend/services/pipecat/pipeline.py

@@ -107,19 +107,19 @@ ON_DEMAND_KNOWLEDGE_SYSTEM_HINT = (
 )
 
 
-async def _wait_for_interrupted_output(
-    worker: PipelineWorker,
+async def _wait_for_output_stop(
+    wait_until_stopped: Callable[[], Awaitable[None]],
     *,
-    wait_until_stopped: Callable[[], Awaitable[None]] | None = None,
+    timeout_seconds: float = 3.0,
 ) -> None:
-    """Wait until an in-band interruption crosses pipeline and playback."""
-    if not await worker.flush_pipeline(timeout=2.0):
-        raise RuntimeError("输出中断帧未能及时穿过媒体管线")
-    if wait_until_stopped is not None:
-        try:
-            await asyncio.wait_for(wait_until_stopped(), timeout=2.0)
-        except TimeoutError as exc:
-            raise RuntimeError("等待客户端语音停止超时") from exc
+    """Wait for the transport's real stop event after an interruption."""
+    try:
+        await asyncio.wait_for(
+            wait_until_stopped(),
+            timeout=timeout_seconds,
+        )
+    except TimeoutError as exc:
+        raise RuntimeError("等待客户端语音停止超时") from exc
 
 
 def _compact_knowledge_metadata(value: str, max_length: int) -> str:
@@ -753,14 +753,8 @@ async def run_pipeline(
 
     async def wait_for_output_stopped() -> None:
         """Keep workflow continuation behind the interrupted output."""
-        wait_until_stopped = (
-            call_end.wait_until_silent if call_end.speaking else None
-        )
-        await _wait_for_interrupted_output(
-            worker,
-            wait_until_stopped=wait_until_stopped,
-        )
-
+        if call_end.speaking:
+            await _wait_for_output_stop(call_end.wait_until_silent)
 
     def set_system_prompt(text: str) -> None:
         """替换上下文里的系统提示(节点切换时整体替换,而非追加)。"""