feat: add UBERON brain anatomy matching for all species

[bendichter]

Summary

• Adds UBERON ontology-based brain region matching, extending anatomy extraction to all species (not just mouse)
• For mice: tries Allen CCF first, falls back to UBERON per-token
• For other species: tries UBERON directly
• Synonym scope is a settable parameter (frozenset[str]), defaulting to EXACT only
• Bundles ~2,400 nervous system descendant terms from UBERON as a compact JSON (~479KB)
• Generation script parses the OBO file directly with no library dependencies

New files

• dandi/data/generate_uberon_structures.py — downloads and parses uberon.obo, extracts nervous system descendants
• dandi/data/uberon_brain_structures.json — bundled lookup data (2,408 structures, 9,717 synonyms)

Modified files

• dandi/metadata/brain_areas.py — UBERON loading, lookup, and matching functions; locations_to_mouse_anatomy() with Allen→UBERON fallback
• dandi/metadata/util.py — _extract_brain_anatomy() now handles all species
• dandi/tests/test_brain_areas.py — tests for UBERON matching, synonym scope control, and Allen/UBERON fallback
• .pre-commit-config.yaml, pyproject.toml — codespell exclusions for new JSON

Test plan

• All 56 brain area tests pass locally
• All 179 metadata tests pass (including existing brain anatomy integration tests)
• Pre-commit passes (black, isort, codespell, flake8)
• CI passes on all platforms

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 86.70886% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.50%. Comparing base (3c7ba2d) to head (2dc05ec).

Files with missing lines	Patch %	Lines
dandi/metadata/brain_areas.py	85.00%	12 Missing ⚠️
dandi/data/generate_uberon_structures.py	0.00%	7 Missing ⚠️
dandi/metadata/util.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@                    Coverage Diff                     @@
##           add-brain-area-anatomy    #1825      +/-   ##
==========================================================
+ Coverage                   75.34%   75.50%   +0.16%     
==========================================================
  Files                          87       88       +1     
  Lines                       12259    12413     +154     
==========================================================
+ Hits                         9237     9373     +136     
- Misses                       3022     3040      +18     

Flag	Coverage Δ
unittests	75.50% <86.70%> (+0.16%)	⬆️

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