fix(ga): web_execute_js 归一化非str的script参数，避免AttributeError中断agent循环

ga.py

@@ -353,7 +353,8 @@ class GenericAgentHandler(BaseHandler):
     def do_web_execute_js(self, args, response):
         '''web情况下的优先使用工具，执行任何js达成对浏览器的*完全*控制。支持将结果保存到文件供后续读取分析。'''
         script = args.get("script", "") or self._extract_code_block(response, "javascript")
-        if not script: return StepOutcome("[Error] Script missing. Use ```javascript block or 'script' arg.", next_prompt="\n")
+        if not isinstance(script, str): script = json.dumps(script, ensure_ascii=False, default=json_default) if isinstance(script, (dict, list)) else str(script)
+        if not script or not script.strip(): return StepOutcome("[Error] Script missing. Use ```javascript block or 'script' arg.", next_prompt="\n")
         abs_path = self._get_abs_path(script.strip())
         if os.path.isfile(abs_path):
             with open(abs_path, 'r', encoding='utf-8') as f: script = f.read()