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/Shared/ClubMembershipContractDialog.razor

@@ -135,7 +135,8 @@
                 new CMSMicroservice.Protobuf.Protos.OtpToken.CreateNewOtpTokenRequest
                 {
                     Mobile = await GetUserMobileAsync(),
-                    Purpose = "ClubContract"
+                    Purpose = "signClubContract",
+                    SignGuid = _signGuid.ToString()
                 });
 
             if (response.Success)
@@ -166,11 +167,9 @@
         _isLoading = true;
         try
         {
-            var userId = await GetCurrentUserIdAsync();
             var response = await ClubMembershipClient.AcceptClubMembershipContractAsync(
                 new CMSMicroservice.Protobuf.Protos.ClubMembership.AcceptClubMembershipContractRequest
                 {
-                    UserId = userId,
                     OtpCode = _otpCode,
                     SignGuid = _signGuid.ToString(),
                     ContractHtml = GetClubContractHtml()