Update Docker configuration, enhance file upload support for PDF, and improve...

Update Docker configuration, enhance file upload support for PDF, and improve localization. Added users.db to .dockerignore and modified login route for secure cookie handling. Refactored settings and text-split components for better structure and functionality.

更新 Docker 配置，增强 PDF 文件上传支持，并改善本地化。将 users.db 添加到 .dockerignore，并修改登录路由以处理安全 cookie。重构设置和文本拆分组件以改善结构和功能。