Add README with project documentation

docs: 更新 progress.txt - 视频/图片轮询恢复修复记录

Fix: 页面加载时自动恢复处理中的图片/视频轮询

docs: 更新 progress.txt - 图片/视频确认后跳转修复记录

Fix: 确认所有图片/视频后不跳转到下一阶段

docs: 更新 progress.txt - dark mode 修复记录

Fix: 强制使用 dark mode

Update progress.txt with stage transition fix

Fix stage transition after confirming all scene descriptions

Update progress.txt with "Generate Scenes" button fix

Fix "Generate Scenes" button not working in draft stage

Update progress.txt with video generation polling fix

Fix video generation: use signed URLs and proper polling

fix: 确认操作后自动更新项目阶段

fix: 使用签名 URL 修复 Storage 图片显示问题