fix(cmmmu): normalize image media inputs - #1618

Summary

• migrate CMMMU image loading to the shared _extract_media path
• support path-backed Hugging Face image dictionaries and detect image MIME types from bytes
• bump the CMMMU evaluation version to v1.1
• add regression coverage for path-backed and ordered multi-image inputs

Problem

The CMMMU adapter reads image_<n>["bytes"] directly and labels every image data URI as PNG. A valid undecoded image value with bytes=None and a usable path therefore raises TypeError, while JPEG bytes are sent with an incorrect PNG MIME type.

Validation

• pytest -q tests/benchmark/test_cmmmu_adapter.py tests/api/test_vision_language_adapter.py tests/benchmark/test_general_vmcq_adapter.py — 25 passed
• pytest tests/cli/test_all.py::TestRun::test_ci_lite -q -p no:warnings — 1 passed
• pre-commit hooks passed for both changed files
• checked 100 records and 111 images from the official CMMMU validation Parquet: content shape, text, image order, and Base64 payloads matched the legacy path; 43 incorrect PNG MIME headers were corrected

Part of #1605.