Initial release: Disc Agenda frisbee tournament platform

Full-stack tournament management app with real-time scoring:
- Go 1.26 backend with REST API and WebSocket live scoring
- React 19 + Vite 8 frontend with mobile-first design
- File-based JSON storage with JSONL audit logs
- Multi-stage Docker build with Gitea CI/CD pipeline
- Post-tournament questionnaire with spirit voting
- Technical documentation and project description

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,9 @@
+frontend/node_modules
+frontend/dist
+backend/vendor
+*.exe
+*.dll
+*.so
+*.dylib
+.git
+.DS_Store