* [CI]【Hackathon 10th Spring No.29】engine unit test
Merge with upstream test_engine.py (PR #7083) and add comprehensive
coverage for LLMEngine: lifecycle, worker signals, requests, utils,
stop_profile, and start error handling.
* fix: add deploy_modality to _make_cfg() — Copilot review
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Co-authored-by: cloudforge1 <cloudforge1@users.noreply.github.com>
Co-authored-by: CSWYF3634076 <wangyafeng@baidu.com>