Add EKÁER admin Blazor page with tabs and logging

Introduced a new Blazor page for EKÁER administration, including a tabbed UI for pending and sent records (grids to be implemented). The code-behind handles user role checks, navigation, and logging initialization. Tab switching logic is stubbed for future development.

FruitBankHybrid.Shared/Pages/Ekaer.razor

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+@page "/Ekaer"
+@using FruitBankHybrid.Shared.Components
+@using FruitBankHybrid.Shared.Databases
+<h3>EKÁER - Adminisztrátor</h3>
+
+<DxDialogProvider />
+
+<div style="margin-top: 30px;">
+
+	<DxLoadingPanel @bind-Visible="LoadingPanelVisibility.Visible"
+					IsContentBlocked="true"
+					ApplyBackgroundShading="true"
+					IndicatorAreaVisible="false"
+					Text="Adatok szinkronizálása folyamatban...">
+
+		<DxTabs ActiveTabIndexChanged="(i) => OnActiveTabChanged(i)" RenderMode="TabsRenderMode.OnDemand" AllowTabReorder="true">
+			<DxTabPage Text="Beküldésre váró">
+				@* A beküldésre váró EKÁER-ek grid-je ide kerül — külön feladat (kliens-metódus, szűrés). *@
+			</DxTabPage>
+			<DxTabPage Text="Elküldött">
+				@* Az elküldött EKÁER-ek grid-je ide kerül — külön feladat (kliens-metódus, szűrés). *@
+			</DxTabPage>
+		</DxTabs>
+	</DxLoadingPanel>
+</div>

FruitBankHybrid.Shared/Pages/Ekaer.razor.cs

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+using AyCode.Core.Loggers;
+using FruitBank.Common.Models;
+using FruitBankHybrid.Shared.Services.Loggers;
+using Mango.Nop.Core.Loggers;
+using Microsoft.AspNetCore.Components;
+
+namespace FruitBankHybrid.Shared.Pages;
+
+public partial class Ekaer : ComponentBase
+{
+    [Inject] public required IEnumerable<IAcLogWriterClientBase> LogWriters { get; set; }
+    [Inject] public required NavigationManager NavManager { get; set; }
+    [Inject] public required LoggedInModel LoggedInModel { get; set; }
+
+    private ILogger _logger = null!;
+    public int ActiveTabIndex;
+
+    protected override Task OnInitializedAsync()
+    {
+        if (!LoggedInModel.IsRevisor) NavManager.NavigateTo("/Login");
+
+        _logger = new LoggerClient<Ekaer>(LogWriters.ToArray());
+        _logger.Info("OnInitializedAsync");
+
+        return base.OnInitializedAsync();
+    }
+
+    protected Task OnActiveTabChanged(int activeTabIndex)
+    {
+        ActiveTabIndex = activeTabIndex;
+        // A fülek tartalma (EKÁER-grid) külön feladat — több előfeltétele van (kliens-metódus, szűrés).
+        return Task.CompletedTask;
+    }
+}