om0 fix camera slug collisions and align ISO fallback order

Review follow-up on the stats aggregation module:

- Distinct camera labels that sanitized to the same slug (e.g. two models
  differing only in punctuation) shared one STATS_CAMERA_PHOTOS list and
  one camera-<slug>.html link, so um0 would render a merged/ambiguous
  per-camera page. Add _stats_resolve_camera_slug, which uniquifies
  colliding slugs with a numeric suffix and tracks ownership in a new
  STATS_SLUG_OWNERS reverse map. It returns via a nameref (not command
  substitution) so the global mutation persists in the caller's shell.
- Align the stats ISO fallback order with album.source.sh's tooltip
  builder (ISOSpeedRatings -> PhotographicSensitivity -> ISO) so a photo
  with multiple ISO tags buckets the same value it displays.
- Document that the format breakdown trusts the file extension.
- Add test_stats_distinct_cameras_get_unique_slugs covering the collision
  fix and slug reuse on re-encounter.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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