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/ท่อ-xy-lent.astro

@@ -3,13 +3,13 @@ import BaseLayout from '@/layouts/BaseLayout.astro';
 ---
 <BaseLayout title="ท่อ XYLENT - ดีล พลัส เทค" description="ท่อระบายน้ำ 3 ชั้น ไซเลนท์ (XYLENT) ระบบ Push Fit เงียบสนิท 22 เดซิเบล จาก Poloplast">
   <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">ท่อ XYLENT</span>
       </nav>
       <div class="grid lg:grid-cols-2 gap-8 items-center">
         <div class="img-hover rounded-2xl overflow-hidden bg-white/10">
-          <img src="/images/products-cropped/XYLENT_001.png" alt="ท่อ XYLENT" class="w-full" loading="eager" />
+          <img src="/images/products-cropped/XYLENT_001.svg" alt="ท่อ XYLENT" class="w-full" loading="eager" />
         </div>
         <div>
           <span class="text-sm text-primary-200 font-medium">ท่อระบายน้ำ</span>
@@ -26,7 +26,7 @@ import BaseLayout from '@/layouts/BaseLayout.astro';
 
   <!-- Product Features -->
   <section class="py-16 bg-white">
-    <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">
       <div class="text-center mb-12">
         <h2 class="text-3xl font-bold text-primary-700 mb-4">เทคโนโลยี 3 ชั้น ไซเลนท์</h2>
         <p class="text-neutral-600 max-w-2xl mx-auto">โครงสร้างผนังท่อ 3 ชั้นที่ทำงานร่วมกันในการลดเสียงและเพิ่มความแข็งแรง ผลิตจาก Polypropylene (PP) เกรดพิเศษ ทนทานต่อความร้อนและสารเคมี</p>
@@ -65,7 +65,7 @@ import BaseLayout from '@/layouts/BaseLayout.astro';
 
   <!-- Benefits -->
   <section class="py-16 bg-neutral-50">
-    <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">
       <div class="grid lg:grid-cols-2 gap-12 items-center">
         <div>
           <h2 class="text-3xl font-bold text-primary-700 mb-6">ข้อดีของท่อระบายน้ำ ไซเลนท์</h2>
@@ -97,10 +97,10 @@ import BaseLayout from '@/layouts/BaseLayout.astro';
           </ul>
         </div>
         <div class="grid grid-cols-2 gap-4">
-          <img src="/images/products-raw/xylent/XYLENT_004-805x1024.png" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
-          <img src="/images/products-raw/xylent/XYLENT_031-771x1024.png" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
-          <img src="/images/products-raw/xylent/XYLENT_016-1024x617.png" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
-          <img src="/images/products-raw/xylent/XYLENT_008-1024x357.png" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
+          <img src="/images/products-raw/xylent/XYLENT_004-805x1024.svg" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
+          <img src="/images/products-raw/xylent/XYLENT_031-771x1024.svg" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
+          <img src="/images/products-raw/xylent/XYLENT_016-1024x617.svg" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
+          <img src="/images/products-raw/xylent/XYLENT_008-1024x357.svg" alt="XYLENT product" class="rounded-xl img-hover" loading="lazy" />
         </div>
       </div>
     </div>
@@ -108,7 +108,7 @@ import BaseLayout from '@/layouts/BaseLayout.astro';
 
   <!-- Applications -->
   <section class="py-16 bg-white">
-    <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">
       <h2 class="text-3xl font-bold text-primary-700 mb-8 text-center">การใช้งานท่อ XYLENT</h2>
       <div class="grid md:grid-cols-2 lg:grid-cols-3 gap-6">
         <div class="flex items-center gap-4 bg-neutral-50 rounded-xl p-4">