feat: Region-datasets join table and simulation year#95

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anth-volk wants to merge 2 commits intoapp-v2-migrationfrom

region-datasets-join-table

Commits on Mar 3, 2026

feat: Replace regions.dataset_id FK with region_datasets join table

anth-volk
and
claude
committed
fix: Update test fixtures to use RegionDatasetLink instead of dataset_id

anth-volk
and
claude
committed