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/middleware.ts

@@ -14,6 +14,7 @@ export function middleware(req: NextRequest) {
     '/signup',
     '/privacy',
     '/newsletter',
+    '/tools',
   ];
 
   // Check if path is public