feat(wallets): show DiscountBalance column in wallet management page; bump proto to 0.0.199

Co-authored-by: Cursor <cursoragent@cursor.com>

src/BackOffice/BackOffice.csproj

@@ -138,7 +138,7 @@
     
     <!-- CMS Protobuf NuGet package (used for both local dev and Docker builds) -->
     <ItemGroup>
-        <PackageReference Include="Foursat.CMSMicroservice.Protobuf" Version="0.0.198" />
+        <PackageReference Include="Foursat.CMSMicroservice.Protobuf" Version="0.0.199" />
     </ItemGroup>
     
     <!-- ============================================================ -->

src/BackOffice/Pages/Wallet/WalletManagementPage.razor

@@ -48,6 +48,11 @@
                             <MudText Color="Color.Success">@context.Item.NetworkBalance.ToString("N0") تومان</MudText>
                         </CellTemplate>
                     </TemplateColumn>
+                    <TemplateColumn Title="موجودی اعتباری">
+                        <CellTemplate>
+                            <MudText Color="Color.Tertiary">@context.Item.DiscountBalance.ToString("N0") تومان</MudText>
+                        </CellTemplate>
+                    </TemplateColumn>
                     <TemplateColumn Title="عملیات" Sortable="false">
                         <CellTemplate>
                             <MudTooltip Text="تاریخچه تغییرات">