fix: stabilize dense-text rejection and serialize delayed image flush

core/websocket_client.py

@@ -468,7 +468,12 @@ class QingjianAPIClient:
         """判断文本是否指代之前的图片（图一/图二/这张/那张/上面那张等）"""
         if not msg:
             return False
-        refs = ("图一", "图二", "第一张", "第二张", "这张", "那张", "上面那张", "下面那张", "刚才那张", "上一张", "下一张")
+        refs = (
+            "图一", "图二", "第一张", "第二张",
+            "这张", "那张", "这图", "那个图",
+            "这个", "这个呢",
+            "上面那张", "下面那张", "刚才那张", "上一张", "下一张",
+        )
         return any(r in msg for r in refs)
 
     def _extract_image_urls(self, msg: str) -> list:
@@ -612,7 +617,9 @@ class QingjianAPIClient:
                     old.cancel()
                 async def _delay_flush(capture_key, capture_data):
                     await asyncio.sleep(self._DEBOUNCE_SECONDS + 4)
-                    await self._flush_pending_images(capture_key, capture_data)
+                    # 与同客户 agent_reply 串行，避免“延迟报价”和“当前追问”并发打架
+                    async with self._get_customer_lock(capture_key):
+                        await self._flush_pending_images(capture_key, capture_data)
                 task = asyncio.create_task(_delay_flush(key, data))
                 self._pending_image_tasks[key] = task
                 return