Replaces the hardcoded 2026 Men's region structure with a per-event
configurable system so the same ncaa_68 template works for Women's
March Madness (different region names and play-in placements each year).
- Add `bracket_region_config jsonb` column to `scoring_events`
- Export `ALL_16_SEEDS` and `BracketRegion`/`BracketPlayIn` interfaces
from bracket-templates.ts so both server and client share the type
- Admin bracket entry form now shows a "Configure Regions" section:
editable region names + add/remove play-in seed selectors (ShadCN
Select) per region; slot map updates live as config changes
- Server action parses region config from form, validates total = 68,
stores it on the event, and passes it to bracket generation
- `advanceFirstFourWinner` reads stored `bracketRegionConfig` from the
event row first, falls back to template.regions for existing events
- Fix opponentSeed formula (was `seedNum <= 8 ? 17-n : n`, always `17-n`)
- Remove duplicate ALL_SEEDS inline definitions (now a shared constant)
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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