Convert CSV files to professionally formatted Excel workbooks with Chinese character support, automatic formatting, and multi-sheet capabilities. Use when users need to: (1) Convert single CSV to Excel, (2) Combine multiple CSV files into one Excel with separate sheets, (3) Format CSV data with headers, borders, and auto-adjusted columns, (4) Handle Chinese or other non-ASCII characters in CSV files, or (5) Create professional Excel reports from CSV data.

将CSV文件转换为专业格式的Excel工作簿，支持中文字符、自动格式化和多工作表功能。适用于以下场景：(1) 将单个CSV文件转换为Excel文件，(2) 将多个CSV文件合并为一个包含多个工作表的Excel文件，(3) 对CSV数据添加表头、边框并自动调整列宽，(4) 处理CSV文件中的中文或其他非ASCII字符，(5) 从CSV数据生成专业格式的Excel报告。