feat(landing-settings): add toggle switches for steps and features visibility

- Introduced toggle switches to enable or disable the display of the "How It Works" and "Platform Features" sections in the landing settings.
- Updated the LandingSettingsModel to include properties for managing the visibility of these sections.

src/BackOffice/Pages/Content/Components/LandingSettingsEditor.razor

@@ -56,6 +56,10 @@
     @* ── Steps ── *@
     <MudExpansionPanel Text="@($"مراحل ({Model.Steps.Count})")" Icon="@Icons.Material.Filled.FormatListNumbered">
         <MudStack Spacing="2" Class="pa-2">
+            <MudStack Row="true" AlignItems="AlignItems.Center" Spacing="1">
+                <MudSwitch T="bool" @bind-Value="_stepsEnabled" Color="Color.Primary" />
+                <MudText Typo="Typo.body2">نمایش بخش «چگونه کار می‌کند؟»</MudText>
+            </MudStack>
             <MudTextField @bind-Value="Model.StepsTitle"
                           Label="عنوان بخش مراحل"
                           Placeholder="سه گام تا شروع"
@@ -99,6 +103,10 @@
     @* ── Features ── *@
     <MudExpansionPanel Text="@($"ویژگی‌ها ({Model.Features.Count})")" Icon="@Icons.Material.Filled.Star">
         <MudStack Spacing="2" Class="pa-2">
+            <MudStack Row="true" AlignItems="AlignItems.Center" Spacing="1">
+                <MudSwitch T="bool" @bind-Value="_featuresEnabled" Color="Color.Primary" />
+                <MudText Typo="Typo.body2">نمایش بخش «امکانات پلتفرم»</MudText>
+            </MudStack>
             <MudTextField @bind-Value="Model.FeaturesTitle"
                           Label="عنوان بخش ویژگی‌ها"
                           Placeholder="چرا کارا بازار سلامت؟"
@@ -329,4 +337,16 @@
         get => Model.FeaturedBlogEnabled ?? true;
         set => Model.FeaturedBlogEnabled = value;
     }
+
+    private bool _stepsEnabled
+    {
+        get => Model.StepsEnabled ?? false;
+        set => Model.StepsEnabled = value;
+    }
+
+    private bool _featuresEnabled
+    {
+        get => Model.FeaturesEnabled ?? false;
+        set => Model.FeaturesEnabled = value;
+    }
 }

src/BackOffice/Pages/Content/Components/SettingsModels/PageSettingsModels.cs

@@ -9,8 +9,10 @@ public class LandingSettingsModel
     public string? HeroButtonPrimaryText { get; set; }
     public string? HeroButtonSecondaryText { get; set; }
     public List<TrustBadgeModel> TrustBadges { get; set; } = new();
+    public bool? StepsEnabled { get; set; }
     public string? StepsTitle { get; set; }
     public List<StepModel> Steps { get; set; } = new();
+    public bool? FeaturesEnabled { get; set; }
     public string? FeaturesTitle { get; set; }
     public List<FeatureModel> Features { get; set; } = new();
     public string? StatsTitle { get; set; }