Add local product detail page with Dutchie comparison

- Add ProductDetail page for viewing products locally
- Add Dutchie and Details buttons to product cards in Products and StoreDetail pages
- Add Last Updated display showing data freshness
- Add parallel scrape scripts and routes
- Add K8s deployment configurations
- Add frontend Dockerfile with nginx

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

backend/Dockerfile

@@ -24,7 +24,6 @@ RUN apt-get update && apt-get install -y \
     --no-install-recommends \
     && rm -rf /var/lib/apt/lists/*
 
-# Tell Puppeteer to use system Chromium
 ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
 ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium
 
@@ -35,6 +34,9 @@ RUN npm ci --only=production
 
 COPY --from=builder /app/dist ./dist
 
+# Create local images directory for when MinIO is not configured
+RUN mkdir -p /app/public/images/products
+
 EXPOSE 3010
 
 CMD ["node", "dist/index.js"]