Merge branch 'kub-stage' into production

- ProductService: add GetProductsPagedAsync with PaginationState support
- Store/Products: replace load-all with page-by-page lazy loading (12 per page)
- DiscountStore/Products: replace pagination with lazy load (load more button)
- Both stores show 'load more' button + loading indicator + 'all shown' text

src/FrontOffice.Main/Pages/DiscountStore/Products.razor

@@ -64,7 +64,7 @@
             <MudText Class="mt-2 mud-text-secondary">در حال بارگذاری...</MudText>
         </MudStack>
     }
-    else if (_result.Products.Count == 0)
+    else if (_products.Count == 0)
     {
         <MudAlert Severity="Severity.Info" Class="my-4">محصولی یافت نشد.</MudAlert>
     }
@@ -72,7 +72,7 @@
     {
         <!-- Products Grid -->
         <MudGrid Spacing="1">
-            @foreach (var p in _result.Products)
+            @foreach (var p in _products)
             {
                 <MudItem xs="6" sm="6" md="3"
                          onclick="@(() => NavigateToProduct(p.Id))">
@@ -119,15 +119,29 @@
             }
         </MudGrid>
 
-        <!-- Pagination -->
+        @* Lazy Load — بارگذاری بیشتر *@
-        @if (_result.TotalPages > 1)
+        @if (_loadingMore)
         {
-            <div class="d-flex justify-center mt-4">
+            <MudStack AlignItems="AlignItems.Center" Class="py-4">
-                <MudPagination Count="@_result.TotalPages" Selected="@_currentPage"
+                <MudProgressCircular Color="Color.Primary" Size="Size.Small" Indeterminate="true"/>
-                               SelectedChanged="OnPageChanged"
+                <MudText Typo="Typo.caption" Class="mud-text-secondary">بارگذاری بیشتر...</MudText>
-                               Color="Color.Primary" Variant="Variant.Filled"
+            </MudStack>
-                               BoundaryCount="1" MiddleCount="3" />
+        }
+        else if (_hasMore)
+        {
+            <div class="d-flex justify-center py-4">
+                <MudButton Variant="Variant.Outlined" Color="Color.Primary"
+                           StartIcon="@Icons.Material.Filled.ExpandMore"
+                           OnClick="LoadMore">
+                    نمایش محصولات بیشتر
+                </MudButton>
             </div>
         }
+        else if (_products.Count > 0)
+        {
+            <MudText Typo="Typo.caption" Align="Align.Center" Class="py-4 mud-text-secondary">
+                همه @(_products.Count) محصول نمایش داده شد
+            </MudText>
+        }
     }
 </MudContainer>

src/FrontOffice.Main/Pages/DiscountStore/Products.razor.cs

@@ -13,9 +13,12 @@ public partial class Products : ComponentBase, IDisposable
     private long? _selectedCategoryId;
     private int _currentPage = 1;
     private bool _loading;
+    private bool _loadingMore;
+    private bool _hasMore = true;
+    private int _totalCount;
     private const int PageSize = 12;
 
-    private DiscountProductListResult _result = new(new(), 0, 0, 1);
+    private List<DiscountProductCard> _products = new();
     private List<DiscountCategoryNode> _categories = new();
 
     protected override async Task OnInitializedAsync()
@@ -27,45 +30,66 @@ public partial class Products : ComponentBase, IDisposable
         var productsTask = ProductService.GetProductsAsync(page: 1, pageSize: PageSize);
         await Task.WhenAll(categoriesTask, productsTask);
         _categories = categoriesTask.Result;
-        _result = productsTask.Result;
+        var result = productsTask.Result;
+        _products = result.Products;
+        _totalCount = result.TotalCount;
+        _hasMore = result.CurrentPage < result.TotalPages;
         _loading = false;
     }
 
-    private async Task LoadProductsAsync()
+    private async Task LoadInitial()
     {
         _loading = true;
+        _currentPage = 1;
+        _products.Clear();
         StateHasChanged();
-        _result = await ProductService.GetProductsAsync(
+        
+        var result = await ProductService.GetProductsAsync(
+            page: 1,
+            pageSize: PageSize,
+            search: string.IsNullOrWhiteSpace(_search) ? null : _search,
+            categoryId: _selectedCategoryId);
+        _products = result.Products;
+        _totalCount = result.TotalCount;
+        _hasMore = result.CurrentPage < result.TotalPages;
+        _loading = false;
+        StateHasChanged();
+    }
+
+    private async Task LoadMore()
+    {
+        if (_loadingMore || !_hasMore) return;
+        
+        _loadingMore = true;
+        StateHasChanged();
+        
+        _currentPage++;
+        var result = await ProductService.GetProductsAsync(
             page: _currentPage,
             pageSize: PageSize,
             search: string.IsNullOrWhiteSpace(_search) ? null : _search,
             categoryId: _selectedCategoryId);
-        _loading = false;
+        _products.AddRange(result.Products);
+        _hasMore = result.CurrentPage < result.TotalPages;
+        
+        _loadingMore = false;
         StateHasChanged();
     }
 
-    private async Task SearchProducts() => await LoadProductsAsync();
+    private async Task SearchProducts() => await LoadInitial();
 
     private async Task OnSearchKeyUp(KeyboardEventArgs e)
     {
         if (e.Key == "Enter")
         {
-            _currentPage = 1;
+            await LoadInitial();
-            await LoadProductsAsync();
         }
     }
 
     private async Task OnCategoryChanged(long? value)
     {
         _selectedCategoryId = value;
-        _currentPage = 1;
+        await LoadInitial();
-        await LoadProductsAsync();
-    }
-
-    private async Task OnPageChanged(int page)
-    {
-        _currentPage = page;
-        await LoadProductsAsync();
     }
 
     private async Task AddToCart(DiscountProductCard p)

src/FrontOffice.Main/Pages/Store/Products.razor

@@ -94,7 +94,7 @@
                 {
                     <MudText Typo="Typo.body2" Class="mud-text-secondary">
                         <MudIcon Icon="@Icons.Material.Filled.Inventory2" Size="Size.Small" Class="me-1"/>
-                        @(_products.Count) محصول
+                        @(_totalCount) محصول
                     </MudText>
                 }
             </MudItem>
@@ -159,5 +159,30 @@
                 </MudItem>
             }
         </MudGrid>
+
+        @* Lazy Load — بارگذاری بیشتر *@
+        @if (_loadingMore)
+        {
+            <MudStack AlignItems="AlignItems.Center" Class="py-4">
+                <MudProgressCircular Color="Color.Primary" Size="Size.Small" Indeterminate="true"/>
+                <MudText Typo="Typo.caption" Class="mud-text-secondary">بارگذاری بیشتر...</MudText>
+            </MudStack>
+        }
+        else if (_hasMore)
+        {
+            <div class="d-flex justify-center py-4">
+                <MudButton Variant="Variant.Outlined" Color="Color.Primary"
+                           StartIcon="@Icons.Material.Filled.ExpandMore"
+                           OnClick="LoadMore">
+                    نمایش محصولات بیشتر
+                </MudButton>
+            </div>
+        }
+        else if (_products.Count > 0)
+        {
+            <MudText Typo="Typo.caption" Align="Align.Center" Class="py-4 mud-text-secondary">
+                همه @(_products.Count) محصول نمایش داده شد
+            </MudText>
+        }
     }
 </MudContainer>

src/FrontOffice.Main/Pages/Store/Products.razor.cs

@@ -24,6 +24,11 @@ public partial class Products : ComponentBase, IDisposable
 
     private string _query = string.Empty;
     private bool _loading;
+    private bool _loadingMore;
+    private bool _hasMore = true;
+    private int _currentPage = 1;
+    private int _totalCount;
+    private const int PageSize = 12;
     private List<Product> _products = new();
     private long? _activeCategoryId;
     private string? _activeCategoryTitle;
@@ -36,7 +41,7 @@ public partial class Products : ComponentBase, IDisposable
         await Cart.EnsureInitializedAsync();
         Cart.OnChange += StateHasChanged;
         Navigation.LocationChanged += HandleLocationChanged;
-        await Load();
+        await LoadInitial();
     }
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
@@ -49,18 +54,40 @@ public partial class Products : ComponentBase, IDisposable
         await base.OnAfterRenderAsync(firstRender);
     }
 
-    private async Task Load()
+    private async Task LoadInitial()
     {
         _loading = true;
+        _currentPage = 1;
+        _products.Clear();
         UpdateCategoryFilterFromUri();
         var sortBy = GetSortByValue();
-        _products = await ProductService.GetProductsAsync(_query, _activeCategoryId, sortBy);
+        var result = await ProductService.GetProductsPagedAsync(_query, _activeCategoryId, sortBy, _currentPage, PageSize);
+        _products = result.Products;
+        _hasMore = result.HasNext;
+        _totalCount = result.TotalCount;
         _activeCategoryTitle = _activeCategoryId is { } categoryId
             ? (await CategoryService.GetByIdAsync(categoryId))?.Title
             : null;
         _loading = false;
     }
 
+    private async Task LoadMore()
+    {
+        if (_loadingMore || !_hasMore) return;
+        
+        _loadingMore = true;
+        StateHasChanged();
+        
+        _currentPage++;
+        var sortBy = GetSortByValue();
+        var result = await ProductService.GetProductsPagedAsync(_query, _activeCategoryId, sortBy, _currentPage, PageSize);
+        _products.AddRange(result.Products);
+        _hasMore = result.HasNext;
+        
+        _loadingMore = false;
+        StateHasChanged();
+    }
+
     private string GetSortByValue()
     {
         return _sortOption switch
@@ -75,12 +102,12 @@ public partial class Products : ComponentBase, IDisposable
 
     private async Task OnSortChanged()
     {
-        await Load();
+        await LoadInitial();
     }
 
     private async Task OnQueryChanged(KeyboardEventArgs _)
     {
-        await Load();
+        await LoadInitial();
     }
 
     private async Task AddToCart(Product p)
@@ -98,7 +125,7 @@ public partial class Products : ComponentBase, IDisposable
 
     private void HandleLocationChanged(object? sender, LocationChangedEventArgs args)
     {
-        _ = InvokeAsync(Load);
+        _ = InvokeAsync(LoadInitial);
     }
 
     private void UpdateCategoryFilterFromUri()

src/FrontOffice.Main/Utilities/ProductService.cs

@@ -26,6 +26,13 @@ public record Product(
         = [];
 }
 
+public record ProductListResult(
+    List<Product> Products,
+    int TotalCount,
+    int TotalPages,
+    int CurrentPage,
+    bool HasNext);
+
 public record ProductGalleryImage(
     long ProductGalleryId,
     long ProductImageId,
@@ -59,11 +66,24 @@ public class ProductService
     }
 
     public async Task<List<Product>> GetProductsAsync(string? query = null, long? categoryId = null, string? sortBy = null)
+    {
+        var result = await GetProductsPagedAsync(query: query, categoryId: categoryId, sortBy: sortBy, page: 1, pageSize: 500);
+        return result.Products;
+    }
+
+    public async Task<ProductListResult> GetProductsPagedAsync(
+        string? query = null, long? categoryId = null, string? sortBy = null,
+        int page = 1, int pageSize = 12)
     {
         try
         {
             var request = new GetAllProductsByFilterRequest
             {
+                PaginationState = new CMSMicroservice.Protobuf.Protos.PaginationState
+                {
+                    PageNumber = page,
+                    PageSize = pageSize
+                },
                 Filter = new GetAllProductsByFilterFilter
                 {
                     Title = query ?? string.Empty,
@@ -84,7 +104,12 @@ public class ProductService
             }
 
             var resp = await _client.GetAllProductsByFilterAsync(request);
-            return MapAndCache(resp.Models);
+            var products = MapAndCache(resp.Models);
+            var totalCount = (int)(resp.MetaData?.TotalCount ?? 0);
+            var totalPages = (int)(resp.MetaData?.TotalPage ?? 0);
+            var hasNext = resp.MetaData?.HasNext ?? false;
+
+            return new ProductListResult(products, totalCount, totalPages, page, hasNext);
         }
         catch
         {
@@ -97,7 +122,8 @@ public class ProductService
                     p.Description.Contains(q, StringComparison.OrdinalIgnoreCase));
             }
 
-            return list.OrderBy(p => p.Id).ToList();
+            var all = list.OrderBy(p => p.Id).ToList();
+            return new ProductListResult(all, all.Count, 1, 1, false);
         }
     }