Add chatId in ws connection

engine/fastgpt_llm.py

@@ -271,6 +271,39 @@ class FastGPTLLMService(LLMService):
             logger.warning(f"FastGPT chat init error: {exc}")
         return None
 
+    async def has_chat_history(self) -> bool:
+        """Return whether FastGPT has persisted records for this chatId."""
+        if not self._app_id:
+            return False
+
+        try:
+            response = await self._client.get_chat_records(
+                appId=self._app_id,
+                chatId=self._chat_id,
+                offset=0,
+                pageSize=1,
+            )
+            response.raise_for_status()
+            data = response.json()
+            records = data.get("data", {}).get("list", [])
+            return isinstance(records, list) and bool(records)
+        except FastGPTError as exc:
+            logger.warning(f"FastGPT chat records failed: {exc}")
+        except httpx.HTTPError as exc:
+            logger.warning(f"FastGPT chat records HTTP error: {exc}")
+        except Exception as exc:
+            logger.warning(f"FastGPT chat records error: {exc}")
+        return False
+
+    async def fetch_session_greeting_text(self, reconnect_greeting: str) -> str | None:
+        """Use opener for a new chatId and a fixed greeting for reconnects."""
+        if await self.has_chat_history():
+            logger.info(f"FastGPT chatId={self._chat_id} has history; using reconnect greeting")
+            return reconnect_greeting.strip() or None
+
+        logger.info(f"FastGPT chatId={self._chat_id} has no history; using app opener")
+        return await self.fetch_welcome_text()
+
     async def _close_active_response(self) -> None:
         response = self._active_response
         self._active_response = None