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/Pages/Club/MembershipPage.razor

@@ -7,14 +7,11 @@
 
 <MudContainer MaxWidth="MaxWidth.Large" Class="py-6">
     <MudStack Spacing="3">
-        <MudStack Row="true" Justify="Justify.SpaceBetween" AlignItems="AlignItems.Center">
-            <MudText Typo="Typo.h5">عضویت باشگاه مشتریان</MudText>
-            <MudButton Variant="Variant.Text" StartIcon="@Icons.Material.Filled.ArrowBack" Href="@RouteConstants.Profile.Index">بازگشت</MudButton>
-        </MudStack>
+        <PageHeader Title="عضویت باشگاه مشتریان" BackHref="@RouteConstants.Profile.Index" />
 
         @if (_isLoading)
         {
-            <MudProgressLinear Color="Color.Primary" Indeterminate="true" />
+            <LoadingState Message="در حال دریافت اطلاعات عضویت..." />
         }
         else if (_membership is not null)
         {