fix: add prefix in app service

[qtencent7]

in main.py of the server folder, the code of setting code looks like this: i think it will be more friendly for rest api if we add route prefix. i add something like this.

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[!IMPORTANT] Add route prefixes /retrieve and /ingest to routers in main.py for REST-friendly API.

• Routing:
  • Add route prefix /retrieve to retrieve.router in main.py.
  • Add route prefix /ingest to ingest.router in main.py.

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[danielchalef]

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[qtencent7]

I have read the CLA Document and I hereby sign the CLA