template url generated error

[Winson-030]

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
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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
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