🏓 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/Dockerfile

@@ -0,0 +1,43 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y \
+    gcc \
+    libpq-dev \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+# Create startup script
+RUN cat > /start.sh << 'EOF'
+#!/bin/bash
+set -e
+echo "Waiting for database..."
+until python -c "
+import psycopg2, os
+try:
+    conn = psycopg2.connect(os.environ.get('DATABASE_URL', 'postgresql://servesync:servesync@db:5432/servesync'))
+    conn.close()
+    print('DB ready')
+except Exception as e:
+    print(f'DB not ready: {e}')
+    exit(1)
+"; do
+  sleep 2
+done
+
+echo "Running seed..."
+python seed.py || echo "Seed already ran or error (continuing)"
+
+echo "Starting server..."
+exec uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload
+EOF
+RUN chmod +x /start.sh
+
+EXPOSE 8000
+CMD ["/start.sh"]