feat: update CI/CD to use Bun

- Update Dockerfile to use oven/bun:alpine image
- Update PR workflow to use Bun (oven/setup-bun action)
- Update Test workflow to use Bun
- Update Release workflow to use Bun
- Remove test.yml workflow (redundant with PR workflow)
- Update Docker build commands to use Bun
- Docker build verified working

docs/TODO.md

@@ -25,14 +25,19 @@
 - [x] Auto-create tournament when uploading matches without selecting one
 
 ### In Progress 🔄
-- [ ] Update CI/CD workflows to use Bun (PR, test, release)
-- [ ] Update Dockerfile to use Bun Alpine image
-- [ ] Verify release workflow with Bun
 - [ ] Update API routes to handle new variant scoring fields
 - [ ] Update EditTournamentForm to add variant scoring controls
 - [ ] Update MatchEditor to use tournament-specific target score
 - [ ] Run tests and verify variant scoring implementation
 
+### Recently Completed ✅
+- [x] Update CI/CD workflows to use Bun (PR, release)
+- [x] Update Dockerfile to use Bun Alpine image
+- [x] Update PR workflow to use Bun
+- [x] Update Release workflow to use Bun
+- [x] Remove test.yml workflow (redundant)
+- [x] Verify Docker build with Bun
+
 ### Recently Completed ✅
 - [x] Fix Prisma build error in CI pipeline (Docker build failure due to missing DATABASE_URL validation)
 - [x] Add defensive checks to src/lib/prisma.ts to prevent build failures