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/tsconfig.json

@@ -2,7 +2,7 @@
   "compilerOptions": {
     "target": "ES2022",
     "module": "commonjs",
-    "lib": ["ES2022"],
+    "lib": ["ES2022", "dom"],
     "outDir": "./dist",
     "rootDir": "./src",
     "strict": true,