'load llm infomation from a json file and add support for OpenRouter' (#1533)

### What problem does this PR solve?

#1467 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>

web/src/assets/svg/llm/open-router.svg

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