Update insulation brand pages (Armaflex, Aeroflex, Maxflex)

- Added 3 new brand pages: armflex.astro, aeroflex.astro, maxflex.astro
- Updated hero images with product photos from 3t-insulation.com
- Enhanced content with product specifications and benefits
- Added standard certifications (FM Approved, UL 94, GREENGUARD)
- Added product gallery sections
- Shortened menu names to brand only (Armaflex, Aeroflex, Maxflex)
- Removed old ฉนวนหุ้มท่อ.astro page
- Updated Header and BaseLayout navigation
- Downloaded product images for all 3 brands

src/pages/water-treatment.astro

@@ -27,7 +27,7 @@ import StickyBottomCTA from '@/components/common/StickyBottomCTA.astro';
   <main class="bg-white min-h-screen pb-24 md:pb-0">
     <!-- Hero Section -->
     <section class="bg-gradient-to-br from-primary-700 to-primary-600 text-white py-12">
-      <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+      <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 relative z-10">
         <nav class="text-sm mb-4 text-primary-100">
           <a href="/" class="hover:text-white">หน้าแรก</a> / <a href="/all-products" class="hover:text-white">สินค้าทั้งหมด</a> / <span class="text-white">ระบบกรองน้ำ</span>
         </nav>