change build messages for qwen in client

app/client/platforms/alibaba.ts

@@ -42,7 +42,7 @@ interface RequestParam {
   result_format: string;
   incremental_output?: boolean;
   temperature: number;
-  repetition_penalty: number;
+  repetition_penalty?: number;
   top_p: number;
   max_tokens?: number;
 }