perf: 优化 token 和 apikey，token 字段也可以用

src/provider/chat-adapter/dashscope.ts

@@ -5,6 +5,9 @@ export class BailianChat extends BaseChat {
   static BASE_URL = 'https://dashscope.aliyuncs.com/compatible-mode/v1';
   constructor(options: BailianOptions) {
     const baseURL = options.baseURL || BailianChat.BASE_URL;
+    if (!options.model) {
+      options.model = 'qwen-plus'
+    }
     super({ ...(options as BaseChatOptions), baseURL: baseURL });
   }
 }