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.

backend/app/routes/health.py

@@ -9,6 +9,6 @@ def health_check():
     """Simple health check — returns 200 if the service is running."""
     return jsonify({
         "status": "healthy",
-        "service": "SaaS-PDF API",
+        "service": "Dociva API",
         "version": "1.0.0",
     })