Compare metadata workflow

[mairasalazar]

Description

• refactor(tests): move activity tests to dedicated directory
• feat(workflow): add compare_metadata workflow
  Add the compare_metadata_with_llm activity to compare pairs of metadata fields (suggested vs current metadata). The LLM judges whether the current metadata describes the underlying file.
  The CompareMetadata workflow calls the PDF text extraction, LLM metadata suggestion, vocabulary resolution, and the new comparison activity.
• feat(schema): match and normalize for comparison pair
  Add matches()/normalize_for_comparison() to Creator, ResolvedLicense and ResolvedFunding so _align() can pair suggested vs. current metadata fields (from the deposit form).
  Since normalize_for_comparison() requires the funder's name from the id, we also move FUNDER_ROR_IDS to extracted_metadata.py and derive FUNDER_NAMES_BY_ROR_ID from it.

Checklist

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