template url generated error

Describe the bug
Refly generate wrong template thumbnail image url

The image src url start 'undefined', which is wrong.

The wrong URL

https://refly.example.com/canvas/undefined/share-cover/can-dx050jn7gr46amvwuge69kso.png

This URL is correct after replace the base domain to api domain

https://reflyapi.example.com/v1/misc/public/share-cover/can-dx050jn7gr46amvwuge69kso.png

log:

2025/04/02 01:37:50 [error] 8#8: *133 open() "/usr/share/nginx/html/canvas/undefined/share-cover/can-vlzquvm1prq22fbuq2rzbzi5.png" failed (2: No such file or directory), client: 10.0.1.249, server: localhost, request: "GET /canvas/undefined/share-cover/can-vlzquvm1prq22fbuq2rzbzi5.png HTTP/1.1", host: "refly.example.com"

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

Locate the code that generates the template thumbnail or share-cover image URL, then compare its output with the incorrect URL and the API URL shown in the issue. Reproduce the request using the provided paths and confirm that the generated URL uses the API endpoint without an undefined segment.