[CI]【Hackathon 10th Spring No.33】config 单测补充 (#6730)

* [CI]【Hackathon 10th Spring No.33】config 单测补充

* fix test_commit_config: reset fields before partial-file test

* [CI]【Hackathon 10th Spring No.33】boost delta coverage for architecture helper branches

* [CI]【Hackathon 10th Spring No.33】add version attr to model config mock

* [CI]【Hackathon 10th Spring No.33】add mrope, runner validation, tail_layer coverage

* [CI]【Hackathon 10th Spring No.33】boost: cover 96 more lines (FDConfig assertions, guided decoding, env branches)

* [CI]【Hackathon 10th Spring No.33】config unit test

* [CI]【Hackathon 10th Spring No.33】cover expert parallel branch

* fix: reset commit hash before _load_from_version_file test; block cuda import via setitem(None)

* refactor: convert to unittest.TestCase style per reviewer request

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Co-authored-by: cloudforge1 <cloudforge1@users.noreply.github.com>
Co-authored-by: CSWYF3634076 <wangyafeng@baidu.com>
Co-authored-by: Tao Luo <luotao02@baidu.com>

Author: 4 people