feat: Rebuild as Court Manager Dashboard v2

- Complete rewrite for single Court Manager user
- Feature 1: Player Management (CRUD, ELO, skill level)
- Feature 2: Court Reservation (timeline, override)
- Feature 3: Match Event Builder (3-step wizard)
  - Step 1: Event setup with player selection + stage calculator
  - Step 2: Stage configurator (Open/Skill/RR/Tournament)
  - Step 3: Auto bracket generation
- Feature 4: Live Court View (main dashboard, 2x2 grid)
- Event Control: score entry, bracket advancement, court assignment
- Screen view: TV display per court (/screen/:id)
- Seed: 8 players, 4 courts, 1 completed + 1 active event
- Routes: / players courts events events/new events/:id screen/:id

backend/Dockerfile

@@ -2,17 +2,13 @@ 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/*
+RUN apt-get update && apt-get install -y gcc libpq-dev && rm -rf /var/lib/apt/lists/*
 
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . .
-RUN chmod +x /app/start.sh
 
-EXPOSE 8000
-CMD ["/app/start.sh"]
+RUN chmod +x start.sh
+
+CMD ["./start.sh"]