feat: enhance SEO capabilities and add All Tools page

- Updated generate-seo-assets script to create separate sitemap files for static, blog, tools, and SEO pages.
- Introduced render-seo-shells script to generate HTML shells for SEO pages with dynamic metadata.
- Added All Tools page with categorized tool listings and SEO metadata.
- Updated routing to include /tools path and linked it in the footer.
- Enhanced SEOHead component to remove unused keywords and improve OpenGraph metadata.
- Updated translations for tools hub in English, Arabic, and French.
- Refactored SEO-related utility functions to support new structured data formats.

frontend/index.html

@@ -7,12 +7,13 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <meta name="description"
     content="Free online tools for PDF, image, video, and text processing. Merge, split, compress, convert, watermark, protect & more — instantly." />
+  <meta name="application-name" content="Dociva" />
+  <meta name="apple-mobile-web-app-title" content="Dociva" />
+  <meta name="theme-color" content="#2563eb" />
   <meta name="google-site-verification" content="tx9YptvPfrvb115PeFBWpYpRhw_4CYHQXzpLKNXXV20" />
   <meta name="msvalidate.01" content="65E1161EF971CA2810FE8EABB5F229B4" />
-  <meta name="keywords"
-    content="PDF tools, merge PDF, split PDF, compress PDF, PDF to Word, image converter, free online tools, Arabic PDF tools" />
   <meta name="author" content="Dociva" />
-  <meta name="robots" content="index, follow" />
+  <meta name="robots" content="index,follow,max-image-preview:large,max-snippet:-1,max-video-preview:-1" />
   <meta property="og:type" content="website" />
   <meta property="og:title" content="Dociva — Free Online File Tools" />
   <meta property="og:description"
@@ -70,4 +71,4 @@
   <script type="module" src="/src/main.tsx"></script>
 </body>
 
-</html>
+</html>