feat: add Docker deployment configuration

- Add server Dockerfile with multi-stage build
- Add frontend Dockerfile with Nginx
- Add docker-compose.yml for orchestration
- Add Nginx config with SSL support
- Add deployment documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,50 @@
+version: '3.8'
+
+services:
+  redis:
+    image: redis:7-alpine
+    container_name: gala-redis
+    restart: unless-stopped
+    volumes:
+      - redis_data:/data
+    networks:
+      - gala-network
+
+  server:
+    build:
+      context: .
+      dockerfile: packages/server/Dockerfile
+    container_name: gala-server
+    restart: unless-stopped
+    environment:
+      - NODE_ENV=production
+      - PORT=3000
+      - REDIS_URL=redis://redis:6379
+      - CORS_ORIGINS=${CORS_ORIGINS:-*}
+    depends_on:
+      - redis
+    networks:
+      - gala-network
+
+  nginx:
+    build:
+      context: .
+      dockerfile: deploy/Dockerfile.frontend
+    container_name: gala-nginx
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./deploy/ssl:/etc/nginx/ssl:ro
+    depends_on:
+      - server
+    networks:
+      - gala-network
+
+volumes:
+  redis_data:
+
+networks:
+  gala-network:
+    driver: bridge