feat: 重大优化更新 - 修复v14.0并发布Pro版

✨ 新功能:
- 创建bilibili_audio_downloader_pro.py (Pro版) - 全新架构重构
- 添加config.json配置文件支持
- 新增INSTALL.md详细安装指南
- 新增VERSION_COMPARISON.md版本对比说明

🐛 Bug修复 (v14.0):
- 修复中文编码显示问题
- 修复ffmpeg进度条计算不准确
- 改进yt-dlp下载进度解析
- 添加重试机制和超时设置
- 完善错误处理和日志记录

🏗️ Pro版优势:
- 面向对象架构设计，代码更清晰
- 自定义异常类和智能错误恢复
- 准确的进度条显示算法
- 完整的日志系统
- 灵活的配置管理
- 更好的用户体验

📚 文档更新:
- 更新README.md，添加版本对比指引
- 更新requirements.txt依赖列表
- 完善项目文档结构

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