Add animated hero background to all product pages

All 30 pages now have the same animated hero effect:
- Mesh gradient blur animation (animate-mesh-1)
- Floating particles
- Water wave SVG animations

Pages updated include ท่อ-ppr-scg, ท่อ-ppr-thai-ppr, ท่อ-hdpe, ท่อ-upvc, ท่อ-xy-lent, เม็กกรู๊ฟ-คับปลิ้ง, water-treatment, อุปกรณ์ปรับอากาศ, ตู้ดับเพลิง, realflex, เทอร์โมเบรค-thermobreak, รั้วเทวดา, ระบบรั้วไวน์แมน

src/pages/water-treatment.astro

@@ -27,7 +27,40 @@ 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 relative z-10">
+      
+    <!-- Animated Background -->
+    <div class="absolute inset-0 overflow-hidden pointer-events-none">
+      <div class="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-[800px] h-[800px] bg-gradient-to-br from-primary-400/30 via-primary-500/15 to-transparent rounded-full blur-[100px] animate-mesh-1"></div>
+      
+      <!-- Floating Particles -->
+      <div class="absolute top-1/4 left-1/4 w-2 h-2 bg-white/30 rounded-full animate-float"></div>
+      <div class="absolute top-1/3 right-1/4 w-3 h-3 bg-primary-300/20 rounded-full animate-float-delayed-1"></div>
+      <div class="absolute top-2/3 left-1/3 w-2 h-2 bg-primary-200/20 rounded-full animate-float-delayed-2"></div>
+      <div class="absolute top-1/2 right-1/3 w-4 h-4 bg-white/15 rounded-full animate-float"></div>
+      <div class="absolute bottom-1/4 left-2/3 w-3 h-3 bg-primary-400/15 rounded-full animate-float-delayed-3"></div>
+      
+      <!-- Water-inspired Waves -->
+      <svg class="absolute bottom-0 left-0 w-full h-[250px] opacity-20" viewBox="0 0 1440 250" preserveAspectRatio="none">
+        <path d="M0,150 Q360,50 720,150 T1440,150 L1440,250 L0,250 Z" fill="none" stroke="url(#water-gradient-hero)" stroke-width="2">
+          <animate attributeName="d" dur="10s" repeatCount="indefinite" values="M0,150 Q360,50 720,150 T1440,150 L1440,250 L0,250 Z;M0,180 Q360,80 720,180 T1440,180 L1440,250 L0,250 Z;M0,150 Q360,50 720,150 T1440,150 L1440,250 L0,250 Z"/>
+        </path>
+        <defs>
+          <linearGradient id="water-gradient-hero" x1="0%" y1="0%" x2="100%" y2="0%">
+            <stop offset="0%" stop-color="#40916c"/>
+            <stop offset="50%" stop-color="#74c69d"/>
+            <stop offset="100%" stop-color="#40916c"/>
+          </linearGradient>
+        </defs>
+      </svg>
+      
+      <!-- Second Wave Layer -->
+      <svg class="absolute bottom-0 left-0 w-full h-[200px] opacity-10" viewBox="0 0 1440 200" preserveAspectRatio="none">
+        <path d="M0,100 Q240,200 480,100 T960,100 T1440,100 L1440,200 L0,200 Z" fill="none" stroke="rgba(255,255,255,0.3)" stroke-width="1">
+          <animate attributeName="d" dur="15s" repeatCount="indefinite" values="M0,100 Q240,200 480,100 T960,100 T1440,100 L1440,200 L0,200 Z;M0,120 Q240,20 480,120 T960,120 T1440,120 L1440,200 L0,200 Z;M0,100 Q240,200 480,100 T960,100 T1440,100 L1440,200 L0,200 Z"/>
+        </path>
+      </svg>
+    </div>
+    <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>