feat(mutilmodel): support mutile model

[yuhao-zh]

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• type is one of: feat, fix, docs, refactor, perf, test, chore.
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• fix: Bug fix.
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💡 Description

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Key Changes

1.Support mutile model on different backend(mlx, sglang, vllm)
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🔗 Related Issues

List any issues this PR closes or relates to:

• Closes [Feature]: Support Multimodality, image understanding #147

✅ Checklist

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• I have performed a self-review of my own code.
• I have added/updated tests that prove my fix or feature works (if applicable).
• I have updated the documentation (if necessary).
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