Revert "[Misc] toy_proxy_server handle min_tokens" (#39706)

[vllm-agent]

Revert of PR #39706

Original PR: #39706
Build: https://buildkite.com/vllm/ci/builds/61784

Reason

This PR is suspected of causing 1 CI failure(s):

• Hyrbid SSM NixlConnector PD accuracy tests (4 GPUs) — accuracy assertion failed (measured 0.7665 vs expected 0.8)

Auto-generated

This revert was auto-generated by the CI failure analyzer.

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[gemini-code-assist]

Code Review

This pull request removes the logic in toy_proxy_server.py that previously stripped min_tokens and min_completion_tokens from request data before sending it to a service and then restored them afterward. I have no feedback to provide as there are no review comments.