fix: await message confirmation interruption

backend/services/pipecat/pipeline.py

@@ -104,6 +104,17 @@ ON_DEMAND_KNOWLEDGE_SYSTEM_HINT = (
     "先调用 search_knowledge_base 检索；回答资料事实时只根据检索内容，"
     "资料不足要明确说明。"
 )
+
+
+async def _interrupt_pipeline_output(
+    source: FrameProcessor,
+    worker: PipelineWorker,
+) -> None:
+    """Broadcast an interruption and wait until it crosses the media pipeline."""
+    await source.broadcast_interruption()
+    await worker.flush_pipeline(timeout=1.0)
+
+
 def _compact_knowledge_metadata(value: str, max_length: int) -> str:
     """Keep tool metadata useful without letting it dominate the model context."""
     compact = " ".join(value.split())
@@ -733,6 +744,10 @@ async def run_pipeline(
         current_enable_interrupt = enable_interrupt
         current_turn_config = normalized
 
+    async def interrupt_output() -> None:
+        """Stop active output through the same boundary as text/voice input."""
+        await _interrupt_pipeline_output(user_input, worker)
+
 
     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)。"""
@@ -766,6 +781,7 @@ async def run_pipeline(
             set_vision_scope=lambda scope: workflow_vision_scope.update(scope),
             vision_function=workflow_vision_function,
             set_input_enabled=lambda enabled: input_state.__setitem__("enabled", enabled),
+            interrupt_output=interrupt_output,
             apply_turn_config=apply_workflow_turn_config,
             flow_global_functions=flow_global_functions,
         ),