feat: add vlm models from siliconflow

[senseb]

Summary

Add VLM models support. see https://cloud.siliconflow.cn/models?tags=%E8%A7%86%E8%A7%89 for VLM models in siliconflow. see: Fixes #10705

Screenshots

Before:	After:
Siliconflow VLM models not supported	Siliconflow VLM models supported

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods