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/src/components/seo/SEOHead.tsx

@@ -2,10 +2,10 @@ import { Helmet } from 'react-helmet-async';
 import { useTranslation } from 'react-i18next';
 import { buildLanguageAlternates, getOgLocale } from '@/utils/seo';
 
-const SITE_NAME = 'SaaS-PDF';
+const SITE_NAME = 'Dociva';
 
 interface SEOHeadProps {
-  /** Page title (will be appended with " — SaaS-PDF") */
+  /** Page title (will be appended with " — Dociva") */
   title: string;
   /** Meta description */
   description: string;