Connect products and blog to Meshkee backend API

- Add src/lib/meshkee.ts API client for the live backend
  (https://api.meshkee.com, tenant aradarisman.com)
- Products list/detail pages now fetch real catalog data,
  images, categories and pricing instead of static mock data
- Blog list/detail pages fetch from /tenants/{domain}/blogs
  with a graceful empty state since no posts are published yet
- Allow the Meshkee media CDN host in next.config.ts
- Remove now-unused static src/data/products.ts and posts.ts

next.config.ts

@@ -7,6 +7,10 @@ const nextConfig: NextConfig = {
         protocol: "https",
         hostname: "images.unsplash.com",
       },
+      {
+        protocol: "https",
+        hostname: "c804387.parspack.net",
+      },
     ],
   },
 };