Avatars cannot be dynamically created

### Describe the bug

With new file storage on authentik 2025.12.1 its not possible anymore to dynamically synchronize avatars.

I had script which would download user avatars to `/media/avatars/{USERNAME}.jpeg` (inside container). Then each user would have property `avatar` set to this path. With new storage, those files are not available.

Even when I updated path to new structure `/data/media/public/avatars/{USERNAME}.jpeg` I cannot use those files as avatars, because browser try to fetch them without adding token to URL, which results in 404. If I use authentik file browser, I can view them but only if token is added to URL.

### How to reproduce

1. Create jpg file with user avatar in `/data/media/public/avatars/`
2. Try to set user `avatar` property to the same path
3. Check user avatar in right upper corner - its not showed.

### Expected behavior

Users should be able to set their own avatars not only manually, but also with external sync scripts.

### Screenshots

### Additional context

https://github.com/goauthentik/authentik/discussions/6824#discussioncomment-15490793

### Deployment Method

Docker

### Version

2025.12.1