can not use upper case for model-name

### 🐛 Describe the bug

hi，
there are two rules for deployment：
- The Service name matches the model.aibrix.ai/name label value in the Deployment.
- The –served-model-name argument value in the Deployment command is also consistent with the Service name and model.aibrix.ai/name label.

`Service name` can not use upper case so that `–served-model-name` can not use upper case. Maybe it is better that replace the match rule for `service name` to `model.aibrix.ai/name` in service lables.

### Steps to Reproduce

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### Expected behavior

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### Environment

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Start by tracing the deployment and Service naming logic described in the issue, including the model.aibrix.ai/name label and the --served-model-name argument. Reproduce the uppercase-name case and determine where the Service-name match is enforced. Done means the naming rules accept the intended model name consistently and the relevant behavior is covered by tests.

Written by the indexing model from the issue text.