feat: 添加国际化、文件上传和专属聊天页面

fix: 添加错误边界和调试日志，更新页面标题为 ClareCourseWare

refactor: ClareCourseWare 教师专用 - 移除所有学生界面，登录后直接显示 TeacherDashboard；简化 App.tsx 为教师专用版本

IST345 course + multi-TA, AI Quiz API doc, courseDirectory and sidebar updates

Add teacher agent, docs, and project updates; ClareVoiceV1 remains untracked (nested repo)

Add Clare product UI: run_web.sh, README, exclude hf_space from push