fix(eval/uni_mmmu): add missing import colorsys for >9-category sliding-puzzle palette

[Anai-Guo]

Problem

In eval/generation/uni_mmmu/eval_ummmu.py, parse_sliding_puzzle_image builds a color palette via a local helper:

SET1_9 = ["#e41a1c", "#377eb8", ...]  # 9 colors

def _distinct_palette_k(k: int) -> List[np.ndarray]:
    if k <= 9: return [ _hex_to_rgb01(SET1_9[i % 9]) for i in range(k)]
    return [np.array(colorsys.hsv_to_rgb(i/float(k), 0.85, 0.95), dtype=np.float32) for i in range(k)]

The k > 9 branch calls colorsys.hsv_to_rgb(...), but colorsys is never imported anywhere in the file. So whenever num_categories > 9 — the very case that branch exists to serve, e.g. a 4×4 sliding puzzle (16 tiles) — the parser raises:

NameError: name 'colorsys' is not defined

The default config (num_categories: 9) takes the SET1_9 branch, so the bug stays latent until a larger board / higher category count is configured, at which point the image-evaluation loop (parse_sliding_puzzle_image is called on every GT and candidate image) crashes.

Fix

Add the missing import colorsys to the stdlib import block (one line, placed alphabetically).

Verification

Extracting the helper verbatim:

k=9 (default): OK
k=16 BEFORE: NameError -> name 'colorsys' is not defined
k=16 AFTER import colorsys: OK len=16

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