Two small fixes in ``fastvideo/entrypoints/cli/eval.py``:
* ``_expand_paths`` deduplicated through ``[x for x in out if not (x in
seen or seen.add(x))]`` — a known idiom that ruff flags because
``set.add`` returns ``None`` (B023/func-returns-value). Replace with
an explicit loop so the side effect doesn't ride on the boolean
expression.
* ``_cmd_run`` constructed ``metrics_arg`` through an
``if/else``-block where SIM108 (project policy) prefers a ternary.
Fold to a single conditional expression.
Pure mechanical cleanups; ``ruff check`` is now clean on the file and
the eval CLI smoke test (``score_video.py`` against a self-paired
mp4 → ``common.psnr=100``) still passes.
shaoxiongduan
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