fix: 防止空路径导致目录被当文件返回的500错误

chore: 删除冗余文件，保持代码干净

feat: 合并 smysle 增强功能

更新模型配置：删除grok-4.1，添加grok-4，更新grok-4.1-thinking版本

补充redme

添加缓存预览独立页

Change default port to 8000

Show cooldown/exhausted token status in admin

fix: 补充 GrokApiException 状态码

chore: 忽略 data 目录

docs: update README with persistence, batch management, and performance optimization details

feat: implement API key and stats/log persistence, batch key management, and async performance optimization

test: add test_key.py for API key verification

style: resize model distribution chart for better layout

docs: update readme with new features