Add automatic score calculation using tenuki scoring engine
- Created scoring utility that uses tenuki to calculate territory scores
- Added GET endpoint to /api/games/[id]/score for fetching suggested scores
- UI now shows "Calculate & Enter Scores" button that fetches auto-calculated scores
- Scores are pre-populated in the form with auto-calculated values
- Shows "Auto-calculated" badge and winner/margin info
- Users can still adjust scores before submitting (for dead stones, etc.)
- Default komi of 6.5 points for white
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>