chore: update project branding from SaaS-PDF to Dociva

- Updated robots.txt to reflect new site name and sitemap URL.
- Modified sitemap.xml to change all URLs from saas-pdf.com to dociva.io.
- Changed storage key for site assistant in SiteAssistant.tsx.
- Updated SEOHead.tsx to change site name in meta tags.
- Translated app name and related text in Arabic, English, and French JSON files.
- Updated contact email in ContactPage.tsx, PrivacyPage.tsx, and TermsPage.tsx.
- Changed internal admin page title to reflect new branding.
- Updated pricing page meta description to reference Dociva.
- Adjusted Nginx configuration for new domain.
- Modified deployment script to reflect new branding.
- Updated sitemap generation script to use new domain.

frontend/public/favicon.svg

@@ -1,7 +1,17 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" fill="none">
-  <rect width="64" height="64" rx="14" fill="#4F46E5"/>
-  <path d="M18 20h20a2 2 0 0 1 2 2v20a2 2 0 0 1-2 2H18a2 2 0 0 1-2-2V22a2 2 0 0 1 2-2z" stroke="#fff" stroke-width="2.5" fill="none"/>
-  <path d="M22 28h12M22 33h8" stroke="#fff" stroke-width="2" stroke-linecap="round"/>
-  <path d="M42 24l6-6M48 18v6h-6" stroke="#93C5FD" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path d="M42 40l6 6M48 46v-6h-6" stroke="#93C5FD" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
+  <!-- Background: rounded square with gradient -->
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="64" y2="64" gradientUnits="userSpaceOnUse">
+      <stop offset="0%" stop-color="#4F46E5"/>
+      <stop offset="100%" stop-color="#7C3AED"/>
+    </linearGradient>
+  </defs>
+  <rect width="64" height="64" rx="14" fill="url(#bg)"/>
+  <!-- Document icon -->
+  <path d="M20 16h14l10 10v22a2 2 0 0 1-2 2H20a2 2 0 0 1-2-2V18a2 2 0 0 1 2-2z" fill="rgba(255,255,255,0.15)" stroke="#fff" stroke-width="2"/>
+  <path d="M34 16v8a2 2 0 0 0 2 2h8" stroke="#fff" stroke-width="2" fill="none"/>
+  <!-- Text lines -->
+  <path d="M24 32h16M24 37h12M24 42h8" stroke="#93C5FD" stroke-width="1.8" stroke-linecap="round"/>
+  <!-- Stylized "D" lettermark -->
+  <text x="39" y="54" font-family="Arial,Helvetica,sans-serif" font-weight="700" font-size="16" fill="#E0E7FF" opacity="0.6">D</text>
 </svg>