fix: improve long-running stability for various channels

nanobot/channels/dingtalk.py

@@ -137,8 +137,15 @@ class DingTalkChannel(BaseChannel):
 
             logger.info("DingTalk bot started with Stream Mode")
 
-            # client.start() is an async infinite loop handling the websocket connection
-            await self._client.start()
+            # Reconnect loop: restart stream if SDK exits or crashes
+            while self._running:
+                try:
+                    await self._client.start()
+                except Exception as e:
+                    logger.warning(f"DingTalk stream error: {e}")
+                if self._running:
+                    logger.info("Reconnecting DingTalk stream in 5 seconds...")
+                    await asyncio.sleep(5)
 
         except Exception as e:
             logger.exception(f"Failed to start DingTalk channel: {e}")