🖼️ 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/robots.txt

@@ -0,0 +1,25 @@
+# Robots.txt for dealplustech.co.th
+# https://dealplustech.co.th
+
+User-agent: *
+Allow: /
+
+# Sitemap location
+Sitemap: https://dealplustech.co.th/sitemap.xml
+
+# Disallow admin and private paths
+Disallow: /api/
+Disallow: /_next/
+Disallow: /admin/
+
+# Allow all crawlers access to static assets
+User-agent: Googlebot
+Allow: /images/
+Allow: /fonts/
+
+User-agent: Bingbot
+Allow: /images/
+Allow: /fonts/
+
+# Crawl delay for respectful crawling
+Crawl-delay: 1