feat: add web UI service to docker-compose

- Add Dockerfile for React web application
- Add nginx configuration for API proxying
- Add web service to docker-compose.yml
- Web UI now accessible on port 3000
- API requests proxied to backend server on port 8080

aggregator-web/Dockerfile

@@ -0,0 +1,29 @@
+# Build stage
+FROM node:20-alpine AS build
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Production stage
+FROM nginx:alpine
+
+# Copy built assets from build stage
+COPY --from=build /app/dist /usr/share/nginx/html
+
+# Copy nginx configuration
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]