feat(providers): add siliconflow (GLOBAL) to built-in providers

[wu21-web]

Description

SiliconFlow is rapidly gaining traction as a major AI infrastructure and Model-as-a-Service (MaaS) provider, boasting over 10 million users. This PR adds the SiliconFlow (international) to built-in providers.

Type of Change

• New feature (non-breaking change that adds functionality)

How Has This Been Tested?

• make test passes locally
• Manual testing (describe below)
  go test and go build

Checklist

• My code follows the project's coding style (go fmt, go vet)
• I have performed a self-review of my code
• I have added tests that prove my fix is effective or my feature works
• New and existing unit tests pass locally with my changes
• I have updated the documentation accordingly (if applicable)
• I have signed the CLA

Related Issues

none

[github-actions]

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