add retry for xiaoniu api requests

plugins/ai_auto_response/config.toml

@@ -18,6 +18,8 @@ timeout_seconds = 45
 temperature = 0.35
 max_tokens = 120
 stream = true
+max_retries = 3
+retry_delay_seconds = 1.0
 
 [mode]
 group_default_mode = "social"