Title: Deepin App Store shows “Loading failed” and filesystem becomes read-only

Description:
Hello everyone,

I am facing an issue with Deepin OS App Store. The App Store always shows “Loading failed” and does not load any content.

Here is what I have already checked and tried:

1. Internet connection is working fine.
2. apt update and system repositories are working correctly.
3. I reinstalled the Deepin App Store.
4. I cleared cache and configuration files.
5. I changed DNS to Google (8.8.8.8) and Cloudflare (1.1.1.1).
6. I tested server connectivity and ping to the App Store backend is working.
7. I restarted the App Store daemon and verified it is active.

However, the issue still persists. The App Store always shows “Loading failed”.

Additionally, I noticed another serious issue:
Some system directories such as /usr/share have become read-only, and I cannot write files there. For example:

touch: cannot touch '/usr/share/testfile': Read-only file system

This suggests that the filesystem might have switched to read-only mode automatically.

Questions:

• Is this a known issue in Deepin OS?
• Could this be related to App Store backend or CDN routing?
• Why did the filesystem become read-only?
• What is the safest way to fix this without reinstalling the OS?

Any help or suggestions would be greatly appreciated.
Thank you.