Enhance app management with 'IsRecommended' feature

- Added 'IsRecommended' property to app-related data models, allowing apps to be marked as recommended.
- Updated API endpoints for creating and updating apps to include 'IsRecommended' in request bodies.
- Modified database schema to accommodate the new 'IsRecommended' field.
- Enhanced frontend components to display recommended apps with a star icon and updated forms to manage this property.
- Improved sorting logic in app listings to prioritize recommended apps.
- Updated documentation to reflect changes in API and data models.

frontend/src/shared/api/types.ts

@@ -102,6 +102,7 @@ export type ClientAppDto = {
   downloadUrl: string
   description: string | null
   iconUrl: string | null
+  isRecommended: boolean
 }
 
 /** GET /api/apps — сгруппировано по ОС на бэкенде; отсутствующая ОС значит "нет приложений". */
@@ -212,6 +213,7 @@ export type AdminAppDto = {
   iconUrl: string | null
   sortOrder: number
   isEnabled: boolean
+  isRecommended: boolean
 }
 
 export type StatsDto = {