🏓 Initial ServeSync demo build

- FastAPI backend with PostgreSQL + Redis
- 4 core features: Registration, Courts, Matchmaking, Tournament
- Double elimination tournament with bracket visualization
- ELO-based matchmaking (Stage 1 Open, Stage 2 Skill-Based)
- Real-time WebSocket updates
- TV Screen display for courts
- Vue 3 + Tailwind CSS frontend
- Seed data: 12 players, 4 courts, active matches, tournament in progress
- Docker compose stack with Nginx reverse proxy

backend/requirements.txt

@@ -0,0 +1,13 @@
+fastapi==0.111.0
+uvicorn[standard]==0.29.0
+sqlalchemy==2.0.30
+alembic==1.13.1
+psycopg2-binary==2.9.9
+redis==5.0.4
+arq==0.25.0
+websockets==12.0
+python-dotenv==1.0.1
+pydantic==2.7.1
+pydantic-settings==2.2.1
+httpx==0.27.0
+python-multipart==0.0.9