Initial commit: Aeroflot Flights Web - Angular 12 baseline

- Angular 12 application with PrimeNG components
- 5 existing Cypress e2e test suites
- SCSS styling with BEM naming convention
- i18n support (10 languages)
- Leaflet map integration
- Complete component hierarchy and routing structure

This baseline will be used for Angular → React migration.

Models/Seo.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+
+namespace Aeroflot.Flights.Web.Models
+{
+    public class Seo
+    {
+        public static readonly List<string> UserAgents = new List<string>() { "Yandex", "Googlebot", "*" };
+
+        public static readonly List<string> LanguagePairs = new List<string>() { "ru-ru", "us-en", "de-de", "it-it", "fr-fr", "es-es", "kr-ko", "cn-zh", "jp-ja" };
+    }
+}