Add CyberMail Email Delivery integration

- New emailDelivery Django app with full platform API integration
- Account connection, domain management, SMTP credentials, relay config
- Auto-configure SPF/DKIM/DMARC DNS records via PowerDNS
- Postfix SMTP relay through CyberMail (configureRelayHost/removeRelayHost)
- Real-time delivery logs, stats, and per-domain analytics
- Single-page AngularJS dashboard with marketing landing page
- Promotional banners on 6 email-related pages with dismiss cookie
- Manual SQL table creation in upgrade.py for existing installs
- Documentation: setup guide, technical reference, user guide

baseTemplate/templates/baseTemplate/index.html

@@ -1937,8 +1937,12 @@
                 <a href="{% url 'Rspamd' %}" class="menu-item">
                     <span>RSPAMD</span>
                 </a>
+                <a href="{% url 'emailDeliveryHome' %}" class="menu-item">
+                    <span>Email Delivery</span>
+                    <span class="badge">NEW</span>
+                </a>
             </div>
-            
+
             <a href="#" class="menu-item" onclick="toggleSubmenu('manage-services-submenu', this); return false;">
                 <div class="icon-wrapper">
                     <i class="fas fa-folder-open"></i>