Cannot Generate Violin Plots for Data Visualization from Uploaded Datasets

Problem Description
The current data-analysis agent does not support the creation of violin plots from uploaded CSV or Excel datasets. This limits the agent's effectiveness in providing comprehensive data visualization for data analysts.

Why This Matters
Violin plots are critical for in-depth data analysis as they show the distribution and density of data for various categories, offering more insight than standard box plots. Their absence hinders a full understanding of data shape, skewness, and multimodality, which are vital for thorough exploratory data analysis (EDA) and effective communication of insights.

定位数据分析代理的入口点和 CSV/Excel 上传路径；未提供文件名或测试。使用上传的数据集运行现有工作流，并将成功生成 violin-plot 作为完成检查。