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/components/common/Header.astro

@@ -56,7 +56,9 @@ const productCategories = [
   {
     title: "ฉนวนและรั้ว",
     items: [
-      { label: "ฉนวนหุ้มท่อ", href: "/ฉนวนหุ้มท่อ" },
+      { label: "Armaflex", href: "/armflex" },
+      { label: "Aeroflex", href: "/aeroflex" },
+      { label: "Maxflex", href: "/maxflex" },
       { label: "เทอร์โมเบรค Thermobreak", href: "/เทอร์โมเบรค-thermobreak" },
       { label: "Realflex", href: "/realflex" },
       { label: "อุปกรณ์ดับเพลิง", href: "/อุปกรณ์ดับเพลิง" },