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

frontend/Dockerfile

@@ -1,7 +1,6 @@
-FROM node:20-alpine AS builder
+FROM node:20-alpine AS build
 
 WORKDIR /app
-
 COPY package.json .
 RUN npm install
 
@@ -9,6 +8,7 @@ COPY . .
 RUN npm run build
 
 FROM nginx:alpine
-COPY --from=builder /app/dist /usr/share/nginx/html
+COPY --from=build /app/dist /usr/share/nginx/html
 COPY nginx-frontend.conf /etc/nginx/conf.d/default.conf
 EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]