feat: full FrontOffice updates - discount store, blog, payment gateway, UI improvements

- Discount store pages (products, cart, orders, order detail)
- Blog pages and services
- Payment gateway callback page
- AppImage component, EmptyState, LoadingState, PageHeader
- DiscountCartService, DiscountOrderService, DiscountProductService
- BlogCategoryService, BlogPostService, SitePageService, ImageCacheService
- PhoneVerifyForm component
- Profile Hub page
- UI/UX improvements across all pages
- landing.js for homepage
- Config and routing updates

src/FrontOffice.Main/Utilities/ProductService.cs

@@ -141,7 +141,7 @@ public class ProductService
                 Title: m.Title ?? string.Empty,
                 Description: m.Description ?? string.Empty,
                 FullInformation: m.FullInformation ?? string.Empty,
-                ImageUrl: string.IsNullOrWhiteSpace(m.ImagePath) ? string.Empty : UrlUtility.DownloadUrl + m.ImagePath,
+                ImageUrl: m.ImagePath,
                 Price: m.Price,
                 Discount: m.Discount,
                 Rate: m.Rate,
@@ -244,7 +244,7 @@ public class ProductService
     
     private sealed record CacheEntry(Product Product, DateTime Expiration);
     private static string BuildUrl(string? path) =>
-        string.IsNullOrWhiteSpace(path) ? string.Empty : UrlUtility.DownloadUrl + path;
+        path ?? string.Empty;
 
     private static IReadOnlyList<ProductCategoryPathInfo> MapCategoryPaths(IEnumerable<ProductCategoryPath>? categories)
     {