feat(index): enable conditional rendering for steps and features sections

- Added support for conditional rendering of the steps and features sections on the landing page, controlled by the new `StepsEnabled` and `FeaturesEnabled` properties in the Index.razor.cs file.
- This enhancement allows for more dynamic content presentation based on user settings, improving the overall user experience.

src/FrontOffice.Main/Pages/Index.razor

@@ -131,7 +131,10 @@
 
 @* ═══════════════════════════════════════════════
    2. HOW IT WORKS — 3 numbered steps
+   (controlled by LandingSettings.StepsEnabled; default off)
    ═══════════════════════════════════════════════ *@
+@if (_settings?.StepsEnabled == true)
+{
 <section class="section-landing">
     <MudContainer MaxWidth="MaxWidth.Large">
         <div class="text-center mb-8 fade-in-up">
@@ -157,10 +160,14 @@
         </MudGrid>
     </MudContainer>
 </section>
+}
 
 @* ═══════════════════════════════════════════════
    3. FEATURES — 6 cards with icons
+   (controlled by LandingSettings.FeaturesEnabled; default off)
    ═══════════════════════════════════════════════ *@
+@if (_settings?.FeaturesEnabled == true)
+{
 <section class="section-landing" style="background:var(--mud-palette-background-gray);">
     <MudContainer MaxWidth="MaxWidth.Large">
         <div class="text-center mb-8 fade-in-up">
@@ -188,6 +195,7 @@
         </MudGrid>
     </MudContainer>
 </section>
+}
 
 @* ═══════════════════════════════════════════════
    4. STATS — Counter cards

src/FrontOffice.Main/Pages/Index.razor.cs

@@ -344,8 +344,10 @@ public partial class Index : IDisposable
         public string? HeroButtonPrimaryText { get; set; }
         public string? HeroButtonSecondaryText { get; set; }
         public List<TrustBadgeItem>? TrustBadges { get; set; }
+        public bool? StepsEnabled { get; set; }
         public string? StepsTitle { get; set; }
         public List<StepItem>? Steps { get; set; }
+        public bool? FeaturesEnabled { get; set; }
         public string? FeaturesTitle { get; set; }
         public List<FeatureItem>? Features { get; set; }
         public string? StatsTitle { get; set; }