Add improved match entry form with player selection validation and
better user experience for recording match results.
Changes:
- Add player validation to prevent same player on both teams
- Add team score validation (must have winner)
- Improve form layout and player selection UI
- Add helper methods for player lookup and team building
- Implement EloCalculator service for 2v2 Euchre matches
- Create background job processing with GoodJob
- Add single match entry form
- Add CSV upload for batch match entry
- Create player rankings view
- Add database schema for matches and elo snapshots
david