feat: add knob for /v1/models to control if respond real models.

[Xunzhuo]

What type of PR is this?

Add knob for /v1/models to control if respond real models.

[github-actions]

👥 vLLM Semantic Team Notification

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

📁 Root Directory

Owners: @rootfs, @Xunzhuo
Files changed:

• .github/workflows/docker-publish.yml
• .gitignore

📁 config

Owners: @rootfs
Files changed:

• config/config.yaml

📁 src

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

• src/semantic-router/pkg/api/server.go
• src/semantic-router/pkg/api/server_test.go
• src/semantic-router/pkg/config/config.go
• src/semantic-router/pkg/extproc/models_endpoint_test.go
• src/semantic-router/pkg/extproc/request_handler.go

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