Rerank api 404 Not Found

Rerank api https://github.com/intel/llm-scaler/tree/main/vllm#rerank-api: **/metrics** needed, instead of v1/rerank:

<img width="337" height="57" alt="Image" src="https://github.com/user-attachments/assets/e142f2ab-3776-4f3a-88ac-f8f74b00c6ed" />

<img width="824" height="43" alt="Image" src="https://github.com/user-attachments/assets/6d648406-ed87-4e1d-81c4-fe79361df3e3" />