fix: Groovy错误消息GString序列化修复+实际JSON截断问题标注

docs/mteam.groovy

@@ -9,7 +9,8 @@ Map parse(String content, String url) {
     try {
         root = json.readValue(content, Map)
     } catch (e) {
-        return [pageName: '解析失败', message: "JSON 解析异常: ${e.message}"]
+        def msg = e.message instanceof String ? e.message : e.toString()
+        return [pageName: '解析失败', message: 'JSON 解析异常: ' + msg]
     }
 
     if (url.contains('/api/member/profile'))