Add branding configuration and assets for Sepehr tenant

- Created branding.config.ts to define branding settings including app title, support contact information, and working hours.
- Added brandingAssets.ts to import and export logo and login images for the Sepehr tenant.
- Introduced config.ts to specify application type as POS for the Sepehr tenant.

public/favicon/site.webmanifest

@@ -28,9 +28,9 @@
     }
   ],
   "id": "/",
-  "name": "نرم افزار صورت‌حساب‌های مالیاتی پاژن",
+  "name": "نرم افزار صورت‌حساب‌های مالیاتی سپاس",
   "scope": "/",
-  "short_name": "پاژن",
+  "short_name": "سپاس",
   "start_url": "/",
   "theme_color": "#ffffff"
 }