fix: deduplicate photos in tag album listings

[Copilot]

• Understand root cause: SELECT DISTINCT … ORDER BY COALESCE(…) crashes on PostgreSQL because raw ORDER BY expressions must literally appear in the SELECT list when using DISTINCT
• Replace ->distinct() with a whereIn('photos.id', $ids_query) approach: access-control JOINs stay inside a subquery that selects photos.id; outer relation query has no JOINs, no DISTINCT, no ORDER BY restriction
• Remove dead duplicate DB query in addEagerConstraints
• Fix PHPDoc annotation: add use App\Models\Builders\PhotoBuilder import, drop FQCN
• All 40 tag-album / paginator tests pass; phpstan clean

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.40%. Comparing base (6687d9e) to head (4a66bfc).

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