feat: use openai sdk replace map struct

[yuluo-yx]

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👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

📁 src

Owners: @rootfs, @Xunzhuo, @wangchen615
Files changed:

• src/semantic-router/pkg/cache/cache.go
• src/semantic-router/pkg/classification/mcp_classifier.go
• src/semantic-router/pkg/consts/consts.go
• src/semantic-router/pkg/decision/engine.go
• src/semantic-router/pkg/k8s/converter.go
• src/semantic-router/pkg/utils/http/response.go

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[rootfs]

@yuluo-yx can you wait a bit on this PR? It would work the best to get all the existing OpenAI API e.g. #542 support finishied before put ting the final touch