Connect product/blog pages, mega menu, and instant search to Meshkee backend

Add /products (list + detail) and /blog (list + detail) routes backed by
the real Meshkee API, a real category-hierarchy mega menu (level 2/3 only),
debounced instant search proxied through a same-origin API route, and
tel:-link fallbacks on product cards when no price is set. Also fixes
Product price normalization to read the real API shape instead of a
guessed one, and hardens product linking against catalog sources that
don't expose a slug.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -16,6 +16,7 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@tailwindcss/typography": "^0.5.20",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",