feat: Add main application views and structure

- Implemented CreateInstanceView for creating new instances.
- Added HostsView for managing SSH hosts with CRUD operations.
- Created InstancesView for displaying and managing instances.
- Developed LogsView for viewing operation logs.
- Introduced SecretsView for managing secrets associated with hosts.
- Established SettingsView for configuring application settings.
- Created MainWindow as the main application window with navigation.
- Added app manifest and configuration files for logging and settings.

OTSSignsOrchestrator.Desktop/ViewModels/LogsViewModel.cs

@@ -0,0 +1,56 @@
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using OTSSignsOrchestrator.Core.Data;
+using OTSSignsOrchestrator.Core.Models.Entities;
+
+namespace OTSSignsOrchestrator.Desktop.ViewModels;
+
+/// <summary>
+/// ViewModel for viewing operation logs.
+/// </summary>
+public partial class LogsViewModel : ObservableObject
+{
+    private readonly IServiceProvider _services;
+
+    [ObservableProperty] private ObservableCollection<OperationLog> _logs = new();
+    [ObservableProperty] private string _statusMessage = string.Empty;
+    [ObservableProperty] private bool _isBusy;
+    [ObservableProperty] private int _maxEntries = 100;
+
+    public LogsViewModel(IServiceProvider services)
+    {
+        _services = services;
+        _ = LoadLogsAsync();
+    }
+
+    [RelayCommand]
+    private async Task LoadLogsAsync()
+    {
+        IsBusy = true;
+        try
+        {
+            using var scope = _services.CreateScope();
+            var db = scope.ServiceProvider.GetRequiredService<XiboContext>();
+
+            var items = await db.OperationLogs
+                .Include(l => l.Instance)
+                .OrderByDescending(l => l.Timestamp)
+                .Take(MaxEntries)
+                .ToListAsync();
+
+            Logs = new ObservableCollection<OperationLog>(items);
+            StatusMessage = $"Showing {items.Count} log entries.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Error loading logs: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+}