Fix n does not take effect in vLLM v1 engine

[pan-x-c]

Description

As the title says

Checklist

Please check the following items before code is ready to be reviewed.

• Code has passed all tests
• Docstrings have been added/updated in Google Style
• Documentation has been updated
• Code is ready for review

[pan-x-c]

/run-unittest

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Pending ⏳	Other ❓	Flaky 🍂	Duration ⏱️
22	22	0	0	0	0	0	818ms

Failed Tests

No failed tests ✨

Flaky Tests

No flaky tests ✨

Skipped

No skipped tests ✨

Tests

Test Name	Status	Flaky	Duration
tests/buffer/queue_test.py::TestQueueBuffer::test_queue_buffer	✅		4ms
tests/buffer/sql_test.py::TestSQLBuffer::test_create_sql_buffer	✅		1ms
tests/common/config_test.py::TestConfig::test_all_examples_are_valid	✅		1ms
tests/common/config_test.py::TestConfig::test_load_default_config	✅		1ms
tests/common/experience_test.py::TestExperienceConversion::test_batch_conversion	✅		1ms
tests/common/experience_test.py::TestExperienceConversion::test_experience_model_experience_conversion	✅		1ms
tests/common/vllm_test.py::TestModelWrapperSyncV0::test_generate	✅		37ms
tests/common/vllm_test.py::TestModelWrapperAsyncV0::test_generate	✅		42ms
tests/common/vllm_test.py::TestModelWrapperAsyncTPV0::test_generate	✅		51ms
tests/common/vllm_test.py::TestModelWrapperAsyncTPV1::test_generate	✅		51ms
tests/common/vllm_test.py::TestModelWrapperAsyncV1::test_generate	✅		38ms
tests/common/vllm_test.py::TestTokenizer::test_assistant_token_mask	✅		1ms
tests/explorer/explorer_test.py::BaseExplorerCase::test_explorer	✅		1ms
tests/explorer/explorer_test.py::TestExplorerCountdownEval::test_explorer	✅		165ms
tests/explorer/explorer_test.py::TestExplorerCountdownNoEval::test_explorer	✅		189ms
tests/explorer/runner_pool_test.py::RunnerPoolTest::test_runner_pool	✅		18ms
tests/explorer/workflow_test.py::WorkflowTest::test_gsm8k_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_math_complex_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_math_fraction_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_math_workflow	✅		1ms
tests/trainer/trainer_test.py::BaseTrainerCase::test_trainer	✅		1ms
tests/trainer/trainer_test.py::TestTrainerCountdown::test_trainer	✅		212ms

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