🖼️ Restore public folder (images, assets) + fix Dockerfile

- Restored public/images from Next.js backup
- Fixed Dockerfile to bind to 0.0.0.0
- Images now served correctly

Fixes:
✅ 404 errors for images
✅ Missing CSS/Tailwind styles
✅ Docker container accessibility

dist/manifest.json

@@ -0,0 +1,26 @@
+{
+  "name": "Deal Plus Tech",
+  "short_name": "DPT",
+  "description": "ผู้เชี่ยวชาญด้านระบบน้ำ จำหน่ายท่อ PPR, ท่อ HDPE, รั้วตาข่าย, อุปกรณ์ท่อน้ำ",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#1e40af",
+  "orientation": "portrait-primary",
+  "icons": [
+    {
+      "src": "/favicon-512.jpg",
+      "sizes": "512x512",
+      "type": "image/jpeg",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/favicon-512.jpg",
+      "sizes": "192x192",
+      "type": "image/jpeg"
+    }
+  ],
+  "categories": ["business", "shopping"],
+  "lang": "th",
+  "dir": "ltr"
+}