more boilerplate and dev environment

frontend/Dockerfile

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+# Build stage
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+# Copy dependency files first for better layer caching
+COPY package*.json ./
+RUN npm ci
+
+# Copy source code and build the static SPA
+COPY . .
+RUN npm run build
+
+# Runtime stage
+FROM nginx:alpine
+
+# Copy the built static files to nginx's default document root
+COPY --from=builder /app/build /usr/share/nginx/html
+
+# Copy nginx configuration
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Expose the port nginx listens on
+EXPOSE 80
+
+# Run nginx in the foreground
+CMD ["nginx", "-g", "daemon off;"]