[Misc] Disable fastapi docs in runtime default action

[brosoul]

Pull Request Description

Disable fastapi docs in runtime.

Currently, it is controlled through environment variables, and in the refactor for issue #319 , startup args will be added to the runtime server.

Related Issues

Resolves: #348

Important: Before submitting, please complete the description above and review the checklist below.

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• PR title includes appropriate prefix(es)
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[Jeffwan]

looks good to me. This resolve a security issue. GreaT!