Add Dockerfile and nginx config for frontend

Dockerfile

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+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copiar archivos de configuración
+COPY package.json package-lock.json ./
+
+# Instalar dependencias
+RUN npm ci
+
+# Copiar código fuente
+COPY . .
+
+# Build de la aplicación
+RUN npm run build
+
+# Production stage
+FROM nginx:alpine
+
+# Copiar archivos del build
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Copiar configuración de nginx
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

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+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Servir archivos estáticos
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Proxy para la API
+    location /api/ {
+        proxy_pass http://backend:8000/api/;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_cache_bypass $http_upgrade;
+    }
+
+    # Configuración de caché para archivos estáticos
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}