feat: Add 19 free QR code tools with SEO optimization

- Added PayPal, Zoom, Teams QR generators
- Added lazy loading for html-to-image (performance)
- Created 19 OG images for social sharing
- Added robots.txt and updated sitemap
- Fixed mobile navigation with accordion menu
- Added 7 color options per generator
- Fixed crypto QR with universal/wallet mode toggle
- Hero QR codes all point to qrmaster.net

src/app/sitemap.ts

@@ -3,6 +3,36 @@ import { MetadataRoute } from 'next';
 export default function sitemap(): MetadataRoute.Sitemap {
   const baseUrl = 'https://www.qrmaster.net';
 
+  // All free tool slugs
+  const freeTools = [
+    'url-qr-code',
+    'vcard-qr-code',
+    'text-qr-code',
+    'email-qr-code',
+    'sms-qr-code',
+    'wifi-qr-code',
+    'crypto-qr-code',
+    'event-qr-code',
+    'facebook-qr-code',
+    'instagram-qr-code',
+    'twitter-qr-code',
+    'youtube-qr-code',
+    'whatsapp-qr-code',
+    'tiktok-qr-code',
+    'geolocation-qr-code',
+    'phone-qr-code',
+    'paypal-qr-code',
+    'zoom-qr-code',
+    'teams-qr-code',
+  ];
+
+  const toolPages = freeTools.map((slug) => ({
+    url: `${baseUrl}/tools/${slug}`,
+    lastModified: new Date(),
+    changeFrequency: 'monthly' as const,
+    priority: 0.8,
+  }));
+
   return [
     {
       url: baseUrl,
@@ -70,5 +100,7 @@ export default function sitemap(): MetadataRoute.Sitemap {
       changeFrequency: 'yearly',
       priority: 0.4,
     },
+    ...toolPages,
   ];
 }
+