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>

prompt/connect-backend-prompt.txt

@@ -0,0 +1,15 @@
+Domain: sanihome.ir
+Documentation for backend is:https://api.meshkee.com/docs/website
+
+
+Login or user icon should go to customer.sanihome.ir.com
+
+Create product page and details >> connect to store items
+Create blog page and details >> connect to blog
+
+Product Menu should be a mega menu with level 2 and 3 of categories - skip level 1
+
+Search input should be instant search - activate when type more than 2 char   
+
+First carousel >> special-sale
+Second carousel >> top-selling