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/FAQ.razor

@@ -116,7 +116,7 @@
     <!-- Contact Support -->
     <section class="py-12 bg-grey-50">
         <MudContainer MaxWidth="MaxWidth.Large">
-            <MudPaper Elevation="3" Class="pa-8   text-center">
+            <MudPaper Elevation="2" Class="pa-8   text-center">
                 <MudIcon Icon="@Icons.Material.Filled.ContactSupport" Size="Size.Large" Color="Color.Primary" Class="mb-4" />
                 <MudText Typo="Typo.h4" Class="mb-3">سوال شما پاسخ داده نشد؟</MudText>
                 <MudText Typo="Typo.body1" Class="mud-text-secondary mb-6">